We also need to know the methods used to restore metal to its original condition.
同时，怎样将金属回复到其原来的状态，也是我们要研究的内容。
They worked hard to restore the old house to its original condition.
他们努力把旧房子修复到最初的状态。
I worked hard to restore the wall and the floor to its former condition.
又费了很大的力把墙壁及地板恢复原状。
I worked hard to restore the wall and the floor to its former condition.
又费了很大的力把墙壁及地板恢复原状。
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