例如苹果，释放出乙烯气体，这是一种植物激素。

Apples, for example, release ethylene gas, a plant hormone.

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例如，苹果释放乙烯气体——一种植物激素，会引起其它食品过早成熟而腐烂。

Apples, for example, release ethylene gas, a plant hormone. It can cause other foods to ripen too quickly.

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乙烯是一种植物激素。在植物生长发育许多方面起着调节作用，特别是促进果实成熟衰老。

Ethylene is an important plant hormone regulating many aspects of plant growth and development, especially ripening of fruits.

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