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Answer: “When the children swing the jump rope to their left using their left hands, the central arc of the cord ripples more than when the rope is swung to the right using their right hands.”

Sometimes people have subtly different functional levels in left-side and right-side physical manipulation. In this instance, a jumping rope brought out some apparent differences in coordination of its handlers. In saying that the leftward rotation “ripples” the arc more than when the rope is rotated right, the writer describes a smooth path becoming a bucking one, like still water becoming choppy. Some other “r” verbs will work—such as ravels and ricochets. However, few other words describe as well the image of an arc, which by definition is smooth and unbroken, becoming irregular in its motion. The key word to consider then is arc, which is smooth. A rippled surface is not smooth. Superior sentences pull together all their elements.
有時候人身體左右的操控能力稍有不同，本句描寫擺動繩子的人顯然左右動作不協調，從轉動的跳繩就能看出。比起向右甩，向左甩時繩子的弧型「ripple」（起伏）更大，原本平順的弧型產生波折，就像平靜的水面起了波瀾。其他「r」開頭的動詞還有「ravel」（糾結）和「ricochet」（彈跳），但要恰當描寫原本平順、連續的弧型在運動時變得曲折不規律，適合的動詞並不多。此外還要考慮句中「arc」（弧形）一詞，弧形是平順的，表面起伏則代表不平順。要寫出優秀的句子，必須整合所有組成元素。