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The black plastic will help seal and the weight of the door holds it down.
黑色塑料膜的作用是密封，而门的重量会把它压住。
youdao
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Weight: the general higher proportion of real wood door, the door is heavy.
重量：一般木门的实木比例越高，这扇门就越沉。
youdao
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Weight: the general higher proportion of real wood door, the door is heavy.
重量：一般木门的实木比例越高，这扇门就越沉。
youdao