Fit for chamfering irregular shape and arc work piece. 可用不规则形状及圆弧形状加工件使用。
Or, they can be more loosely bound, irregularly shaped groupings of up to several thousands of stars, like the open clusters shown in this image. 或者他们能更加疏松的联合在一起,由数千颗恒星所组成的不规则形状,就象这张图中的疏散星团。