Our body needs plenty of air when we are asleep.
我们睡觉时身体需要充足的空气。
When we feel hungry, it is said that our body needs food.
当我们感到饥饿，我们的身体就需要食物。
Walk on:Just like the body, our brain needs physical exercise too.
行走：和身体一样，我们的大脑也需要锻炼。
Walk on:Just like the body, our brain needs physical exercise too.
行走：和身体一样，我们的大脑也需要锻炼。
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