The cover has deep ridges. These collect rainwater.
该覆盖物有很深的脊状结构，用来收集雨水。
They lay their eggs on the inside of the pitchers, and tadpoles grow up swimming in the tiny pools of rainwater that collect in the bottom of these plants.
它们把卵产在猪笼草内。蝌蚪在猪笼草内由雨水聚集而成的小水池中生活。
A drainage basin is the area where these tributaries collect rainwater. A river with all its tributaries is called a river system.
流域是支流蓄水的区域。一条河流连同它的全部支流一起，叫做水系。
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