影响油锯择伐作业中保留木损伤率的因素很多，经过分析可知采伐强度、林分密度和采伐木单株材积是影响保留木损伤率的主要因素。

Selective cutting intensity, stand density and felling tree volume per stem were considered as the major influencing factors by analyzing related researches at home and abroad.

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之后，在1994年，研究者们宣称木菜板上保留的细菌比塑料菜板更少。

Then, in 1994, researchers declared that wood retained fewer bacteria than plastic.

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屋顶下面的这个教室的形式是由三个木围墙和保留的小花园的位置界定的。

Below the roof the form of this classroom is defined by the position of three timber enclosures and small retained gardens.

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