树木所起的作用不止于保持水土。树木还吸收水份、防止洪水突发，并使河流不至于含有可杀死鱼类的泥沙沉淀。
Trees do more than keep the soil in place. They also soak up water and prevent flash floods, and keep rivers clear of sediment that can kill fish.
多晶硅能促进硅片内的氧沉淀成核和生长，起内吸杂作用。
The polysilicon can enhance oxygen precipitation nucleating and growing, acting as the intrinsic gettering.
多晶硅能促进硅片内的氧沉淀成核和生长，起内吸杂作用。
The polysilicon can enhance oxygen precipitation nucleating and growing, acting as the intrinsic gettering.
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