我们知道水都是往下运动的，就好比如同下雨一样，但是你会发现如果在右边的水也向下运动，就会产生一个空隙，在吸管里会有一段真空部分。
We know the water moves downwards when its left to itself as in rain, but you see if it moves downward on the right that would leave a gap, vacuum a hole in the pipe.
我们都知道接下来会怎样，水将通过吸管流到右边。
And as we know what will happen that the water will pass up the pipe and down on the right hand side.
水泵并不是实际的吸：更确切的说，水泵产生非完全的真空，然后大气压力将水通过吸管推进水泵中。
Pumps do not actually suck ; rather , pumps create a partial vacuum into which atmospheric pressure pushes water via the suction pipework.
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