副詞 one by one:

1. in single file
   同義詞：one after another, one at a time
2. one piece at a time
   同義詞：by the piece
3. apart from others
   同義詞：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.
   所有的申請者一個接著一個參加面試。
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.
   退休后的幾年里，他還同很多老同事保持著聯(lián)系，但隨著時間的推移，他們的聯(lián)系就一個一個地中斷了。
4. Let's get on the bus one by one.
   讓我們一個一個地上車吧。
5. One by one they got out.
   他們一個一個地走了出去。