同时如果我想让一个物体平移，我还要克服重力的作用，否则它就会垂直下沉。
I also had to exert a mild mental push against gravity if I wanted to keep an object moving in a straight horizontal line; otherwise it would sink vertically.
我们的主意是争取能垂直下沉到池底并停留在那儿呼气，直到你准备蹬离池底并返回到水面。
The idea is to be able to sink straight down to the bottom of the pool and stay there exhaling until you are ready to push off the bottom and come back up.
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