Select Edge Ring Tool 选择横向圈形线 ; 循环边选择工具 ; 选择平行边工具
Select Edge Ring 选择环形边
Connect Edge Ring 环连接边
edge roll ring 边部辊环
Gray isn't just for hair. Some people develop a gray ring around the edge of the cornea.
不只是头发会变成灰色，有些人眼角膜的边缘也会变成灰色。
What you see: There's a whitish-colored ring along the outer edge of your cornea.
现象：你的角膜的外缘有一个白圈。
The profiles are calculated in such a way that, under normal load conditions, life-reducing edge stresses do not occur at a tilting angle of up to 4' between inner ring and outer ring (Table 5.2).
通过这种方式计算的轮廓，在正常的载荷情况下，内外圈之间的偏斜角度超过4＇时不会发生缩减寿命的边缘应力（表5.2）。
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