Thirty-eight years ago I set a series of stakes in it to determine its rate of motion.

三十八年前， 我在它上面放了一系列木桩以确定它的运动速度。

It is a mouthful, but it really just confirms what we deduced earlier: the rate of motion of a gas is inversely proportional to the square root of its mass.

这是一个满口，但它确实只是证实了我们之前的推论：气体的运动速率与其质量的平方根成反比。