名词
中文翻译：笼子
同义词：
['pen', 'penstock', 'penstock pipe', 'penstock valve', 'penstock gate']
例句：
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1. The animals werekept in cages to protect them from the wild.
这些动物被关在笼子里以保护它们免受野生动物的伤害。
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2.The farmer used a penstock to divert water from the river to his fields.
农民使用一个阀门将河水引到他的田地。
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3. The penstock pipe was damaged during the construction of the dam.
大坝建设期间，阀门管损坏了。