plant leaf surface

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。

Most frost damage takes place at night. Ice crystal from on the leaf surface. They pull moisture from the leaves and keep plant tissues form getting water.

大多数霜冻灾害发生在夜里。冰晶来自叶子表面。他们从叶子和来自取水的保存植物组织析出水分。

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。