靠加长或缩短这根水柱，天线就能调节到相应的信号频率。
The aerial can be adjusted to the frequency of those signals by lengthening or shortening the spout.
在重放的过程中可以改变磁带的速度，以使时间基准拉长或缩短。
By varying the tape speed during playback, the time base can be extended or compressed.
如果动物不开心、生了病，它们就不产奶，所以虐待动物或缩短它们的寿命并不符合农场的利益。
Unhappy, ill animals do not produce milk, so it's not in the farm's interests to mistreat them or shorten their lifespan.
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