以下为句子列表：
英文: Applying common engineering sense, the shape of a manhole cover is entirely determined by the shape of the opening it is intended to cover.
中文: 从工程学的角度来看，井盖的形状完全取决于它要覆盖的洞口的形状。
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英文: Or the manhole cover outside your apartment?
中文: 还是你公寓外面的下水井盖？
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英文: Why are manhole cover round in shape?
中文: 点解下水道的盖是圆形的？
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英文: Why is a manhole cover round?
中文: 为什么下水道的盖子是圆形的？
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