| 释义 |
平动píngdòng物体运动时,物体内任何两点连成的直线始终保持它的方向不变,这种运动叫作平动。{translation (of an object); translational motion; remove or change from one place to another while keeping the straight line between any two points in the object moving in the same direction; nonrational displacement;}也叫also平移{píngyí}。 |