A float selected to provide a certain weight, and chemical resistance to the fluid.
花车选择，以便提供一定的体重，耐化学性的液体。
When a body is immersed in a fluid, it apparently loses weight.
身体浸入水中就会明显减轻重量。
'fast runners are fast despite their body weight and fluid status, "he says."
“快跑步者就是快跑步者，无论他们的体重和补水状态如何，”他说。
Weight gain may mean your body is having trouble getting rid of extra fluid.
体重增加可能表示您的身体有排出多馀水份的困难。
Weight gain may mean your body is having trouble getting rid of extra fluid.
体重增加可能表示您的身体有排出多馀水份的困难。
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