The cartons are well protected against moisture by polythene sheet lining.
纸板箱内有塑料布衬里，有很好的防潮湿作用。
I have overcome this problem by placing a sheet of polythene over the top of the container.
我在容器上盖了一片聚乙烯塑料薄膜，解决了这个问题。
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