B2 any basic substance that is used in or produced by a reaction involving changes to atoms or molecules化学品;化学制品
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They use special chemicals to accelerate the growth of crops.
Organic chemicals are used in the manufacture of plastics, fibres, solvents and paints.
The body produces chemicals that are natural painkillers.
Toxic chemicals continue to be dumped in the North Sea.
Many chemicals have a damaging effect on the environment.
B2 relating to chemicals化学的;化学制品的
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Sodium chloride is the chemical name for common salt.
All chemical weapons facilities will be deactivated.
Estimates of the amount of money needed to decontaminate the heavily polluted chemical installations vary.
We had to learn chemical formulae at school, but I can only remember H2O for water.
The chemical properties of coal are still incompletely understood.
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