旋转轴的英文：axis of rotationrevolution axisrevolving shaftrevolving spindlerotation axissymmetry axis参考例句：The centre of gravity is displaced by a weight below the rotational axis.调节旋转轴之...阅读全文
垂直于的英文：be normal to ;perpendicular to参考例句：The vertical displacement ??1mm is normal to the bars ab and BC and hence does not affect their length竖向位移?牛?mm垂直于ab和BC，故不影响它们的长度。The plum...阅读全文
