They found a bacterium visible to the human eye.他们发现了一种肉眼可见的细菌。They have isolated the bacterium in its pure form.他们已经把细菌分离出来,使它们处于较纯的状态.A bacterium is identified as the cause for his duodenal ulcer.一种细菌被断定为造成他十二指肠溃疡的根源....
从山上冲刷下来的泥土就要让水电大坝淤塞了。The soil washed from the hills is silting up the hydroelectric dams.大使馆内的水电都被切断了。Light and water in embassy buildings were cut off.水电的潜力因地而异.The potential of hydroelectricity of one region varies fro...