He understood how they worked hard to support their families.
他了解他们如何努力工作来养家。
How long have they worked there?
他们在那里工作多久了？
How long have they worked here?
他们在这里工作了多久了？
But even if they worked, how much time would they save?
但即便按这些按钮有效，你又能节省多少时间呢？
How long have they worked on the farm?
他们在农场工作多久了？
We can imagine how hard they have worked.
可以想见，他们付出了多么艰苦的努力。
We can imagine how hard they have worked.
可以想见，他们付出了多么艰苦的努力。
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