条例规定样品必须用两个不漏水的容器封装起来。

The rules state that samples must be enclosed in two watertight containers.

《柯林斯英汉双解大词典》

树皮在用树枝做好的框架中被拉长、延展，然后缝合在一起并用树脂密封好，就是那些从树中流出的黏黏的液体。当它干了以后就不漏水了。

The bark was stretched over frames made from tree branches, stitched together and sealed with resin—you know that the sticky liquid that comes out of the tree—and when it dries, it's watertight.

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这就保证下雨天屋顶不漏水。

This will ensure that your roof doesn't leak when it rains.

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