Precipitation is a key determinant of plant productivity in forest, whilst in arid regions there is an approximately liner increase in primary productivity with increasing precipitation.
降雨量是森林植物生产量的关键决定因子，而在干旱地区，初级生产量随降雨量的增加大致是一个线性增长。
Landfill is a primary method of ultimate disposition of municipal solid waste in many countries. The liner system of such disposal field is the key part of the whole system.
城市固体废弃物填埋场是许多国家最终处置固体废弃物的主要方法，其衬垫系统是填埋场整个系统中最关键的部位。
The fabric self-lubricating liner is the key factor to the performance of self-lubricating spherical bearings with heavy load, impact resistance, and long life and so on.
织物自润滑衬垫的性能是保证关节轴承具备重载、耐冲击、长寿命等特性的关键因素。
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