leaf surface of plant 植物叶表面
If you have a live aloe vera plant in the house, cut the leaf lengthwise and remove the pulp - avoid the yellow juice near the leaf surface.
如果你在家里养了芦荟，你可以纵向的切开它的叶子，把果肉切掉，注意不要移除叶子表面的黄色液汁。
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.
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。
Test probing is the key process for determining host plant selection, and the chemical composition of the leaf surface wax may play an important role.
试验性刺探是粉虱确定对宿主植物选择的关键过程，而叶表蜡层中的化学物质可能起重要作用。
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