【摘 要】
：
Koalas only eat tree leaves. Those leaves have a small amount of energy（能量）. Koalas need to sleep a lot to save energy. When we get tired, we breathe（呼吸） slowly. And we take in less air. A yawn can g
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Koalas only eat tree leaves. Those leaves have a small amount of energy（能量）. Koalas need to sleep a lot to save energy.
When we get tired, we breathe（呼吸） slowly. And we take in less air. A yawn can give us more air.
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