The plane linkage was generalized to a root-face hybrid system that composes of a planar particle system and a planar rigid body system.

根据平面连杆机构的组成特点，将平面连杆机构抽象成由平面质点系和平面刚体系组成的一个有根平面混合系统。

youdao

I must face up to the fact and find out the root cause. If necessary, I will change my way and then move on.

我必须面对我的失败，找出其根本原因。如果必要的话，我将会改变我的方式，继续前进。

youdao

You still have debt left, and this doesn't get to the root of the problem - you still face symptoms of sleep deprivation over the course of your week.

你还有欠债，因而这无法治问题的根本：你依然会面临一周过程中睡眠缺乏导致的症状。

youdao

These recommendations take root based on personal, face-to-face communication that establishes sellers as trusted sources.

FORBES: How Instant Mobile Commerce Will Disrupt The Way You Do Business

He started to fall again, caught himself, froze in a hunched-over position, hurtled forward, fell flat on his face, chucked his chin on a root.

NEWYORKER: Tenth of December