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She alternated singing and dancing.
她一会儿唱歌,一会儿跳舞。
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Joy and grief alternated in my heart.
我心中悲喜交替。
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Hope and fear alternated in my breast.
我忽而充满希望,忽而担心。
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His parents alternated in looking after him.
他的父母轮流看护他。
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He alternated between hope and despair.
他时而充满希望,时而绝望。