by number

例句：

1. 1. Please put your books in their designated spots by number.
   请将你的书按照编号放好。
2. 2.The teacher asked us to write our answers on the board by number.
   老师让我们按编号在黑板上写答案。
3. 3. We need to sort the items by number to make sure they are all in order.
   我们需要按编号排序，确保所有物品都整齐有序。