This gives improved retractor blade stability with the mechanical advantage of a lever.

这样增加了牵开翼的稳定性，同时兼具杠杆原理的力学优势。

youdao

This gives improved retractor blade stability with the mechanical advantage of a lever.

这样增加了牵开翼的稳定性，同时兼具杠杆原理的力学优势。

youdao