one by one

副词 one by one:

1. in single file
   同义词：one after another, one at a time
2. one piece at a time
   同义词：by the piece
3. apart from others
   同义词：individually, separately, singly, severally, on an individual basis

1. He shot arrows one by one, but each missed.
   他射了一箭又一箭，但都未射中。
2. All the applicants were interviewed one by one.
   所有的申请者一个接着一个参加面试。
3. For some years after his retirement he kept up with a number of his old workmates, but as time went by he dropped them one by one.
   退休后的几年里，他还同很多老同事保持着联系，但随着时间的推移，他们的联系就一个一个地中断了。
4. Let's get on the bus one by one.
   让我们一个一个地上车吧。
5. One by one they got out.
   他们一个一个地走了出去。