Just only need contacts between the air-poweredpump and 2" hole of standard barrel to fulfill the functions."
所有功能实现，只需要气力泵与标准桶的一个2“联结?。
2
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.
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.