One is that the fluid pressure inside the tree decreases—something like dehydration.

一种观点认为，树木内部的液体流动压力下降——就像失水一样。

He noted that a lack of gravity can change the fluid pressure in living things.

他指出，失重会改变生物体内的流体压力。

This would be a problem in space because an individual would not have the weight necessary to keep the same fluid pressure the body was used to on Earth.

这在太空中将会是一个问题，因为人没有必需的体重来保持身体在地球上所习惯的相同的液体压力。