pure benzene

例句：

1. 1.Pure benzene is a colorless liquid that is used in the production of plastics and other chemicals.
   纯苯是一种无色液体，用于生产塑料和其他化学品。
2. 2. Benzene is a chemical compound that is used to make dyes and paints.
   苯是一种化学化合物，用于制造染料和油漆。
3. 3.The benzene ring has a symmetrical structure, which makes it useful in the synthesis of many different compounds.
   苯环具有对称结构，这使得它在合成许多不同化合物中非常有用。