chemical

英 ['kemɪk(ə)l] 美['kɛmɪkl]

n. 化学制品，化学药品
adj. 化学的

反义词 mechanical

CET6 考研 TEM4 CET4 核心词汇

英英释义

1. produced by or used in a reaction involving changes in atoms or molecules

同义词辨析

drug, medicine, medication, remedy, cure, chemical

这些名词都有"药"之意。

drug：普通用词，含义广泛，可指任何用于预防或治疗肉体上或精神上疾病的药品。用复数形式，多指毒品。

medicine：普通用词，可指药物的总称，也指一切有利于健康的东西。

medication：指医生开给病人用的一切药物，从最简单的阿斯匹林到最复杂的药物。

remedy：普通用词，侧重指对恢复健康有效的药品或治疗方法。

cure比remedy更强调使身体恢复健康的疗法或良药。

chemical：多指工业或化学中的药品，有时也指医药中的药品。

考试真题

A drug is a chemical substance.

The supervisor of the laboratory is beginning to get headaches and dizzy spells because she says it's dangerous to breathe some of the chemical smoke there.

Muscle performance can also be affected by a phenomenon called "central fatigue", in which an imbalance in the body's chemical messengers prevents the central nervous system from directing muscle movements effectively.

It will drive producers of chemical fertilizers out of business.

In cases where sewage mud is used, expensive chemical fertilizer use can be avoided.

Way up north in the Canadian Arctic, seabirds are picking up dangerous chemicals in the ocean and delivering them to ponds near where the birds live.

The bodies of fish and other meat eaters can build up high levels of the chemicals.

Salmon also carry dangerous chemicals as the fish migrate between rivers and the sea.

People who live, hunt or fish near bird coloniesneed to be careful, the researchers say, The birds don’t mean to cause harm, but the chemicals they carry can cause major problems.

We can tear apart the great grass cover of the western plains and pour toxic chemicals into the soil until the soil is dead and blows away in the wind.

Chemical testing showed that over the two years before her death, she moved about every two months.

Heating this chemical compound drives off carbon dioxide gas, leaving calcium oxide.

The chemical composition of rainfall changes slightly as rain clouds move.

The method relies on measuring how chemical variations in drinking water show up in people's hair.

Although we may not be aware of chemicals like pheromones consciously, we give and receive loads of information through smell in every interaction with other people.

But she expects using the chemical in some kind of industrial process-not simply "millions of worms thrown on top of the plastic".

Changing levels of body chemicals called hormones not only make teenagers' bodies develop adult characteristics, but also make it hard for teenagers to fall asleep before 11 pm.

Her popular 1962 book Silent Spring raised awareness of the dangers of pollution and the harmful effects of chemicals on humans and on the world's lakes and oceans.

Hormones are chemicals which are produced by the body to control various body functions.

In contrast, humans do not seem to be as gifted as other animals at detecting such chemicals.

In study after study, it appears that these chemical conversations help the neighbors.

Many animals give off pheromones — natural chemicals that can be detected by, and then can produce a response in, other animals of the same species.

Other experts say part of the problem is chemical.

So condors with high levels of lead are sent to Los Angeles zoo, where they are treated with calcium edta, a chemical that removes lead from the blood over several days.

Some plants pump out smelly chemicals to keep insects away.

These chemicals come from the injured parts of the plant and seem to be an alarm.

They are affected by certain body chemicals.

What the plants pump through the air is a mixture of chemicals known as volatile organic compounds, vocs for short.

Where we use sound and sight to communicate, ants depend primarily on pheromone, chemicals sent out by individuals and smelled or tasted by fellow members of their colony.

95 knit miniskirt in all its 2,300-pius stores around the world, it must rely on low-wage overseas labor, order in volumes that strain natural resources, and use massive amounts of harmful chemicals.

实用场景例句

a chemical element: 化学元素

the chemical industry: 化学工业

chemical reactions/processes: 化学反应 / 过程

The raw sewage is chemically treated.: 未经处理的污水要进行化学处理。

...the chemical composition of the ocean.: 海洋的化学成分

The whole food chain is affected by the overuse of chemicals in agriculture.: 整个食物链因农业生产过程过多使用化学品而受到影响。

...a chemicals company.: 化工公司

...chemical reactions that cause ozone destruction.: 导致臭氧受到破坏的化学反应

The chemical plant proposed to increase production and practise economy and other factories presently responded.: 化工厂提出增产节约的倡仪,其他工厂随即响应.

Soil consists of various chemical substances.: 土壤由各种化学物质组成.

A catalyst is a substance which speeds up a chemical reaction.: 催化剂是一种能加速化学反应的物质.

The risin and tannin that can be extracted from it are sought by the chemical industry.: 从中提取的松香和鞣酸是化学工业上很需要的.

The explosion of the chemical plant has poisoned many local residents.: 那座化工厂的爆炸毒死了许多当地居民.

The same water was reused after chemical treatment.: 原来的水经过化学处理之后再度使用.

The chemical must be salted out and allowed to dry.: 必须把这种化学物质加盐分离出来并让它变干.

The chemical formula for water is H 2 O.: 水的化学分子式是H2O.

The chemical fertilizer should be well dug in.: 化学肥料应该均匀地混入土壤中.

The soil has been poisoned with chemical waste from the factory.: 土壤被从工厂排出的化学废料污染了.

A chemical factory blew up in the North of England.: 英国北部的一座化工厂爆炸了.

The state allotted them large quantities of chemical fertilizer.: 国家给他们调拨了大量化肥.

chemical additives in petrol: 汽油中的化学添加剂

Chemical weapons are banned internationally.: 国际上禁止使用化学武器。

a report produced by the government in cooperation with the chemical industry: 政府与化工行业合作提出的一份报告

Chemical products were used liberally over agricultural land.: 化学产品曾被大量地用于农田。

Such a war could result in the use of chemical and biological weapons.: 这样的战争可能导致使用生化武器。

They are taking precautionary measures to safeguard their forces from the effects of chemical weapons.: 他们正采取预防措施保护其军队免受化学武器的伤害。

双语例句

1. Some of the companies illegally sent the wherewithal for making chemical weapons.: 有些公司非法为制造化学武器提供所需的资金和设备等。

2. The chemical structure of this particular molecule is very unusual.: 这个特殊分子的化学结构很不寻常。

3. The chemical companies had amalgamated into a vast conglomerate.: 那些化学品公司已经合并成一个庞大的企业集团。

4. Catalysts are materials which greatly speed up chemical reactions.: 催化剂是可以大大加速化学反应的物质。

5. The Department maintains many close contacts with the chemical industry.: 这个部门与化工行业保持着众多密切的联系。

英文词源

chemical: chemical: [16] Essentially chemical, and the related chemistry and chemist, come from alchemy with the initial al- dropped. Alchemy itself is of Arabic origin; al represents the Arabic definite article ‘the’, while the second element was borrowed from Greek khēmíā ‘alchemy’. Loss of al- seems to have taken place originally in French, so the immediate source of the English words was French chimiste and chimique (whence the now obsolete English chemic, on which chemical was based).

At first this whole group of words continued to be used in the same sense as its progenitor alchemy; it is not really until the 17th century that we find it being consistently applied to what we would now recognize as the scientific discipline of chemistry.
=> alchemy
chemical (adj.): 1570s, "relating to chemistry," from chemic "of alchemy" (a worn-down derivative of Medieval Latin alchimicus; see alchemy) + -al (1). In early use also of alchemy. Related: Chemically.
chemical (n.): 1747, from chemical (adj.). Related: Chemicals.

词态变化

复数: chemicals;副词: chemically;

chemical

英英释义

同义词辨析

考试真题

实用场景例句

双语例句

英文词源

词态变化

推荐单词

外语单词汇总

英语考试词汇

英文频率词汇