Modern artificial hearts are less cumbersome, but they are still rather unwieldy because they use compressed air to pump the blood and are powered by heavy batteries.
相比之下，现代的人造心脏装置虽没那么笨重，但可操作性仍然不强，因为人们须借助外接电池组提供动力用压缩空气将血液输送往全身各个部位。
In places such as India, ingenious, if slightly dangerous, devices exist whereby a fan is used to blow air through a mesh of straw which has water trickling through it powered by a small pump.
在印度之类的地方，那里有一种巧妙但或许稍有危险的设备，它利用风扇将空气吹过一个利用小型水泵而流淌着水的秸秆网来降温。
Introduce the high powered technical requirement, present production and use state as well as the manufacture of the air sampling pump.
介绍大气采样泵的高性能技术要求、生产和使用现状及高性能旋转式气泵的研制。
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