装底

例句：

1. 1. The engineer had to fix the leak in the pipe.
   工程师不得不修理管道的泄漏。
2. 2.The box was mounted on the wall with screws.
   盒子用螺丝安装在墙上。
3. 3.The car was securely fastened to the trailer before we left.
   在我们离开之前，汽车被牢固地系在拖车上。