森林覆被率在保持水土、涵养水源、改善生态环境方面起着很大作用。
The rate of coverage of forest have an evident effect on many environment factors such as soil and water reservation ecological environment improvement.
剃齿刀是齿轮加工中的精加工刀具之一，选择最优的剃齿刀参数对提高齿轮加工效率和加工质量起着很大作用。
How to choose the optimal shaving cutter parameters is crucial to improve efficiency and processing quality of the gear processing.
在城市污水处理系统中，污水提升泵站在污水排放系统中起着很大作用，担负着将全市污水输送到各污水处理厂的重任。
In the urban sewage treatment system, sewage pumping station in sewage system plays a big role, shoulder to the task that convey the sewage to the sewage treatment work.
在城市污水处理系统中，污水提升泵站在污水排放系统中起着很大作用，担负着将全市污水输送到各污水处理厂的重任。
In the urban sewage treatment system, sewage pumping station in sewage system plays a big role, shoulder to the task that convey the sewage to the sewage treatment work.
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