| 词汇 | rotation |
| 词根词缀 | 词源： 1555, from L. rotationem (nom. rotatio), noun of action from rotare "revolve, roll," from PIE *roto- (see rotary). Verb rotate is an 1808 back-formation. Rotator "muscle which allows a part to be moved circularly" is recorded from 1676. |
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