upside down mounting

例句：

1. 1.The engineer had to upside down mount the new machine.
   工程师不得不倒着安装新机器。
2. 2. The car was upside down mounting on the roof.
   汽车倒挂在屋顶上。
3. 3. The construction workers were upside down mounting the scaffolding.
   建筑工人在倒挂安装脚手架。