1. Azeotropy refers to the phenomenon of two or more liquids forming a constant boiling mixture.
共沸是指两种或更多液体形成一个恒定沸腾混合物的现象。

2. The azeotropic mixture of ethanol and water has a boiling point lower than either pure ethanol or pure water.
乙醇和水的共沸混合物的沸点低于纯乙醇和纯水的沸点。