Englishfor English speakers
chemical
Noun
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A chemical is a basic substance that is used in or produced by mixing elements or other chemicals.
When you burn plastics, you put dangerous chemicals into the air.
The chemical industry in China is producing more and more useful paints, glues, and other products.
chemical
Adjective
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Of or about chemicals.
This test can detect small changes in the chemical composition of water.
blockage
Noun
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A blockage is something that is stops other things from moving.
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Blockage is the state of being blocked.
They called the plumber as there was a blockage in the toilet bowl.