用以保持止动环的槽。

Snap ring used to maintain the groove.

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这个环会帮助保持腿的内旋。

The loop will help maintain the inward turn of the legs.

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对于脸，我尽我所能，保持对整个表面都有流畅的环切式布线（就是一嘴和眼睛那些一圈一圈的布线）。

For the face, I do my best to keep circulars edgeloops over the overall surface.

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引进了弱整环、弱主理想环、弱欧氏环等概念，研究了环的直和保持的一些性质。

Introduce the new concepts of weak domain, weak principal ideal ring and weak Euclidean ring.

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对照组保持纤维环完整。

In the control group, fibrous anulus was intact.

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带定位环，保持注水流畅；

Retaining ring for continuous flow of water ;

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带定位环，保持注水流畅；

Retaining ring for continuous flow of water ;

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