Even after harvest, some kinds of produce should be kept apart. Apples, for example, release ethylene gas, a xplant hormone. It can cause other foods to ripen too quickly.

• 即使收获后，一些种类的农产品应该分开放。例如，苹果会释放乙烯气体，一种植物激素。能使其他事物更快成熟。