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.
它的叶子和根茎能用于医用用途。
The leaves and stems can also be used for medicinal purposes.
它的叶子和根茎能用于医用用途。
The leaves and stems can also be used for medicinal purposes.
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