return tube boiler

例句：

1. 1.The students will return to their seats after the presentation.
   演讲结束后，学生们将回到座位上。
2. 2.He returned the borrowed book to the library yesterday.
   他昨天把借来的书还给了图书馆。
3. 3. She decided to return the money she had received for her purchase.
   她决定归还她购买时收到的钱。