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Apples emit a lot of ethylene gas .

苹果会释放大量乙烯气体。

With potatoes , the ethylene has a different effect : it stops them from sprouting .

而乙烯对于土豆有着不同的作用，它让土豆停止发芽。

Ethylene is a plant hormone that can cause some foods to ripen too quickly .

乙烯是一种植物激素，能够导致一些食物成熟太快。

Apricots , melons and tomatoes also release a lot of ethylene .

杏、甜瓜和西红柿也释放乙烯。

The american chemistry council has counted $ 30 billion-worth of new investments that will boost ethylene capacity by a third .

美国化学理事会（americanchemistrycouncil）认为，新增的300亿美元投资将使乙烯产量提高三分之一。