rotationn.
英 rə(ʊ)'teɪʃ(ə)n | 美 ro'teʃən
中文n. 旋转；循环，轮流
词根词源
rotation (n.)1550s, from Latin rotationem (nominative rotatio) "a turning about in a circle," noun of action from past participle stem of rotare "turn round, revolve, whirl about, roll," from PIE *ret- "to run, roll" (see rotary).
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