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。

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A hatred that scores the face of every swallow-burrowed scarp, nourishes the root of every fruit tree, and supercedes all other loyalties and enmities.

这种仇恨刻在每一个燕子筑巢的绝壁上，滋养着每一棵果树的根系，取代了其他一切的忠诚和敌意。

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There are two prominent muscle in on either side of the face, white, with small black spots, bead point of steel needle of a root beard.

脸的两边有两块突出的肌肉，白白的，上面有一粒粒小黑点，点上有一根根钢针般的胡须。

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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