spherical union swivel

例句：

1. 1. The spherical unionswivel is an essential tool forastronauts during spacewalks.
   球体联合旋转器是宇航员在太空行走时必不可少的工具。
2. 2. Thespherical unionswivel allows the robotto rotate its arm in any direction, making it versatile and useful.
   球体联合旋转器使机器人的手臂能够向任何方向旋转，使其具有灵活性和实用性。
3. 3. The spherical unionswivel was designed to simplify theprocess of assembling complex machinery.
   球体联合旋转器的设计是为了简化组装复杂机械的过程。