Common salt is a compound of sodium and chlorine.

食盐是钠和氯的复合物。

If you evaporate a little sea water on a porcelain dish; on cooling, crystals of common salt will deposit on the sides of the dish.

如果你将少许海水放到瓷盘中蒸发, 冷却后就会有普通食盐的结晶附着在盘的四周。