问题描述：
英语翻译
Birds that are literally half-asleep—with one brain hemisphere alert and the other sleeping—control which side of the brain remains awake,according to a new study of sleeping ducks.
Birds that are literally half-asleep—with one brain hemisphere alert and the other sleeping—control which side of the brain remains awake,according to a new study of sleeping ducks.
问题解答：
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