1、
Disc pack: A grouping of two or more rigid magnetic recording discs on a common axis.
磁碟组: 同轴组合的两个或以上的硬磁碟.
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2、
3、
4、
Finding the common tangent of two circular cone curves with the communal axis of symmetry
求具有公共对称轴线的二圆锥曲线的公切线
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5、
Of a leaf shape; featherlike; having leaflets on each side of a common axis.
一种叶子形状；羽毛状；在每个公共轴线附近都有小叶。
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