| 单词 | chemical |
| 释义 | noun | adjective chemicalchemical1 /ˈkɛmɪkəl/ ●●● S3 W2 AWL noun [countable] 1science, chemistry a substance that is used in or produced by a chemical process: Farmers are moving away from the use of chemicals and pesticides. Toxic chemicals have been found in the groundwater.2a drug, especially an illegal one: The clinic treats cases of chemical abuse.COLLOCATIONSadjectives/nouns + chemicaldangerous/harmful/hazardous chemicals The sign on the truck said that it was carrying hazardous chemicals. Many cleaning products contain chemicals that can be harmful.toxic/poisonous chemicals (=harmful to people and other living things) The chemicals that were released were highly toxic.industrial/agricultural chemicals Some deaths from cancer are related to industrial chemicals.household chemicals (=used for cleaning in the home) Keep household chemicals out of reach of children.synthetic chemicals (=made by mixing artificial substances) None of us lives in an environment that is free from synthetic chemicals.brain chemicals (=produced in the brain) The drug raises levels of certain brain chemicals.verbsuse chemicals Farmers use chemicals to kill insects that would destroy their crops.produce chemicals Some plants produce toxic chemicals to protect themselves.release chemicals When we laugh, our brains release chemicals that make us feel good.contain chemicals Tobacco smoke contains thousands of different chemicals.be exposed to chemicals (=be in an environment where chemicals are present) Many of the workers at the factory were regularly exposed to dangerous chemicals.chemical + nounsthe chemical industry The chemical industry is important to the town’s economy.a chemical plant/factory There has been an explosion at a chemical plant in Germany.a chemical reaction (=a change that happens when chemicals are mixed) When you mix the baking soda and the vinegar, a chemical reaction occurs.a chemical element (=a substance that contains one type of atom) Quartz rocks contain only two chemical elements: silicon and oxygen.a chemical compound (=a substance containing two or more chemical elements) Glycerin is a chemical compound that is used in many liquid medicines.a chemical fertilizer (=a chemical to help plants grow) Many crops are grown with chemical fertilizers.chemical waste People who illegally dump chemical waste will be given prison sentences.chemical weapons (=poisonous chemicals used as weapons) The treaty banned chemical weapons.chemical warfare There is now also the threat of chemical warfare. noun | adjective chemicalchemical2 ●●● W3 AWL adjective science, chemistry relating to or used in chemistry, or involving the changes that happen when two substances combine: chemical engineering a chemical analysis of the substance the chemical composition of the atmosphere The disease is caused by a chemical imbalance in the brain. [Origin: 1500–1600 Modern Latin chimicus alchemist, from Medieval Latin alchimicus]—chemically /-kli/ adverb: chemically treated water |
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