This normal variation in rhythm is known as sinus arrhythmia.
节律的这种正常变化称为窦性心律失常。
Sound also has its unique aesthetic value, for the beauty of rhyme, rhythm, and melody come from the combination and variation of sounds.
声音在文学作品中具有独特的审美价值，韵律美、节奏美、旋律美是声音的组合变化所产生的美。
"I could hardly follow his fast speed and variation of rhythm, " said the 25-year-old.
“我几乎不能跟上他的速度与节奏变化。”25岁的李宗伟如是说。
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