名词
中文翻译：笼口
同义词：
['cage', 'cage cover']
例句：
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1. The bird was caught in thenet and its cage knob wasbroken.
这只鸟被网捕获了，它的笼口盖也断了。
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2. The oldman sat on a bench with his cageknob open.
老人坐在长凳上，笼口盖敞开着。
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3. Thedog's cage knob wasloosened by the wind.
风把狗的笼口盖吹松了。