或身体和精神双重受损 combination of impairments
农民扮演着双重角色：第一，尽可能多地生产粮食供给城市消费，不管粮食收购价有多低，农民受损有多严重；第二，为城市提供廉价劳动力。
Farmers had two roles: first, to produce as much grain as possible for urban consumption, however ruinously low the prices; second, to provide cheap Labour to the cities.
双重介质储层受损害的主要原因，是外来液相的侵入或固相颗粒的堵塞。
The invasion of extrinsic liquid phase and the plugging of solid-phase particle are the main factors which damage dual-media reservoirs.
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