上人工心脏已经无法自动改变他们的抽水速度和外部都必须经过调整。
Previous artificial hearts have been unable to automatically vary their pumping speed and must be tweaked externally.
况且在20世纪60年代，人们抽水速度就已经超过地下蓄水层可吸纳地面水自行补充的速度。
Already by the 1960s, people were pumping groundwater faster than it could be replenished by water soaking back into the ground.
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