When dolphins sleep, the brain only half in the rest, the other half awake to help breathing cycle.

当海豚睡觉的时候，大脑只有一半在休息，另一半还醒着以助呼吸循环。

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When dolphins sleep, the brain only half in the rest, the other half awake to help breathing cycle.

当海豚睡觉的时候，大脑只有一半在休息，另一半还醒着以助呼吸循环。

youdao