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很明显，乙烯是水果中天然的植物激素，使水果成熟。
Ethylene is the natural plant hormone in fruit that makes them turn ripe, apparently.
youdao
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现在是水果成熟的时间。
It is the time that the fruit are ripe.
youdao
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为了使这些水果成熟得更快，要把他们放在柜子上2至5天。
To help these fruits ripen faster, keep them on the counter for 2 to 5 days.
youdao