现在，科学家已经了解到这些微小气孔收缩的机制。
Now, scientists know how these tiny pores tighten in plants.
在显微镜下观察一片树叶时，可以看见数千个小气孔。
When a leaf is looked at under a microscope , it is seen to have thousands of little breathing pores .
用放大镜可见的细小气孔，引导冲击波进入错综复杂的微空间中。
Small pores, visible with a magnifying glass, channel the blast into mazes of micro-chambers.
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