They are problems left over by history.
这些是历史遗留下的问题。
They are problems left over by history?
他们是历史遗留下来的问题。
These are all problems left over by history.
这些都是历史遗留下来的问题。
We must continue to solve problems left over by history.
历史遗留的问题还要继续解决。
They are problems left (which have been left) over by history.
这是历史遗留下来的问题。
They are problems left (which have been left) over by history.
这是历史遗留下来的问题。
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