筒盖必须有紧凑的封条，而且盖子不能有尖锐的边缘。

Cart lid must ensure a tight seal with the lid and have no sharp edges.

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车筒的顶部应该结实光滑以防止变形，并在筒盖滑落到人的手上时能确保安全，不伤害到人。

Cart tub upper lip must have a "finished edge" to help prevent warping and ensure safety of operation if the should fall on a person's fingers.

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把盖子盖在垃圾筒上。

Put the lid on the garbage can.

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