但是，当二氧化碳含量高时，叶孔收缩。
But when carbon dioxide levels are high, the leaf pores shrink.
检查各种门、窗、人孔盖、烟囱百叶窗、舱口盖操作的便利性和可靠性。检测烟囱百叶窗的闭合性。
Inspect the convenience and reliability of all kinds of doors, Windows, manhole covers, hatch. Inspect the closing of louver of funnel.
这是这个原因，这使得它比传统塑料通风孔或百叶窗更好。
It's because of this, that makes them better than a conventional plastic vent or louver.
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