... principal character 主特征 principal circle 主圆 principal coefficient of contraction 主收缩系数 ...
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31英寸宽的主圆窗，是有史以来最大的窗户。四周的六扇窗户是梯形的。
The 31-inches main circular window is the biggest window ever bound for space. The six windows on the perimeter are trapezoid-shaped.
在这种机床上，砂轮作旋转主运动圆工作台旋转作圆周进给运动，砂轮架作间歇的竖直切入运动。
Rotating table for the grinding wheel for the rotating main movement circular week for sports, grinding wheel rack for intermittent movement of vertical cutting.
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