[no obj.]the spout usually unscrews or lifts off easily.

这喷嘴通常容易旋开或掀掉。

The orbiter lifts off vertically like an expendable launch vehicle but makes an unpowered descent similar to a glider.

飞行器像可耗尽的发动工具一样垂直发射升空，但以类似滑翔机的无动力方式降落。 收藏。