He has repaired the machine for two hours.
他修理这台机器已有两小时了。
This type of machine can be assembled in a few hours.
这台机器已经组装好了，现在我们要试验了。
My uncle spent two hours in repairing the machine.
我叔叔修那台机器用了两个小时。
The machine has been repaired for two hours.
这台机器已修了两小时了。
After several hours the machine finally ran out of money.
数小时后这台取款机的现金被取空。
It took my uncle two hours to repair the machine.
我叔叔修那台机器用了两个小时。
Having been in operation for many hours, the electrical machine became rather hot.
电机运转了好几个小时，变得非常热。
Having been in operation for many hours, the electrical machine became rather hot.
电机运转了好几个小时，变得非常热。
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