当植物的叶子或根茎被切开时，植物就发出痛苦的信号(或者也许仅仅是不高兴)：在整个表面释放出气体乙烯。
When a leaf or a stem is sliced, the plant signals pain (or perhaps merely dismay) by releasing the gas ethylene over its entire surface.
声学证据表明苹果释放出的乙烯气体比其他植物高，能够引起附近植物枯萎。
Acoustical evidence demonstrates that apples emit higher levels of ethylene, which causes neighbouring plants to wilt.
声学证据表明苹果释放出的乙烯气体比其他植物高，能够引起附近植物枯萎。
Acoustical evidence demonstrates that apples emit higher levels of ethylene, which causes neighbouring plants to wilt.
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