For weeks, the Union soldiers worked on the canal. They dug through mud and wet clay.

几个星期以来，北方士兵一直在挖运河，他们不断地挖掘泥浆和粘土，许多人得病死了。

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The canal would soon fill up with mud if not regularly dredged.

这条运河如果不经常疏浚，就会淤塞。

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The canal would soon fill up with mud if not regularly dredged.

这条运河如果不经常疏浚，就会淤塞。

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