send in

动词 send in:

1. mail in; cause to be delivered
2. give one's name or calling card to a servant when making a formal visit

1. I will like to know what we shall have to do if we agree to send in our bid.
   我想知道，如果我们同意投标应该做哪些事情。
2. After the scandal, he have to send in his papers.
   出了丑闻後，他不得不辞职。
3. I've decided to send in an agent to gather intelligence, but if he gets caught it will stir up a hornet's nest on the diplomatic front.
   我已决定派一名特工人员去收集情报，但是如果他被抓住的话，那就会给外交战线带来麻烦。
4. The general decided to play his ace and send in the tanks.
   将军决定使出绝招，派坦克参加战斗。