You have broken our agreement by not doing the work you promised.
你没有座你答应的工作，你已违反了我们之间的协议。
He paved the way for me by doing careful work.
他通过仔细的工作为我铺好路子。
By power is meant the rate of doing work.
所谓功率指的是做工的速率。
By power, we mean the rate of doing work.
对于功率我们指的是作功的速率。
By power is meant the speed of doing work.
所谓功率指的是做功的速度。
通过做志愿者工作。
通过做志愿者工作。
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