但也一些含有巨毒，如苯和铅。
Others, though, were extremely toxic, such as benzene and lead.
芳烃是环状碳氢化合物，如苯，甲苯和二甲苯。
The aromatics are ringed hydrocarbons, such as benzene, toluene and xylene. Benzene is used to make polystyrenes e.g.
某些药物，如苯二氮类药物，这是镇静剂和安眠药。
Certain drugs such as benzodiazepines, which are tranquillisers and hypnotics.
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