By replacing plants with impervious surfaces, cities trap heat, and create a phenomenon known as the urban heat island.

城市中因为缺少植物，地表使用了不挥发水分的材料，所以热量无法散掉，造成了城市热岛现象。

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Be careful not to cover plants too closely, which could trap heat and defeat the purpose of shading.

注意不要把植物遮盖得过于密实，那样会使热量散发不出去，达不到遮荫的目的。

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There are a few other plants with rapid movement abilities (such as the Venus fly trap) but this is the most bizarre and least known.

很少有其他植物有这种快速摇动枝叶的能力(如捕蝇草)，但舞草是最神奇且不为人所知。

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This bare, sandy earth then becomes an effective rain trap - with no vegetation, water cannot be lost through transpiration (the evaporation of water from plants).

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Beijing catches so much of the pollution from coal-burning power plants because it sits at the center of a ring of mountains, which help trap the smog.

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