A pressure pump with special nozzles makes the fine fog.

一个带有特质喷嘴的压力泵可以制造这种薄雾。

The heart's entire purpose is to maintain that same kind of pressure gradient, by generating high hydrostatic pressure to pump blood out of the heart, while also creating low pressure to bring it back in.

心脏的全部目的是保持同样的压力梯度，通过产生高静水压将血液泵出心脏，同时也产生低压将血液带回来。