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1.Have you ever wondered why children always seem to have bags of energy and never run out of steam?
run out of steam 精疲力竭；失去势头
I'm afraid I can't climb to the top, I've run out of steam.
我恐怕爬不到顶了，我已经没力气了。
2.Researchers have discovered that children have the stamina and levels of recovery of endurance athletes.
stamina 精力；毅力
You have to have a lot of stamina to be a top-class dancer.
你得很有毅力才能成为一名顶级舞蹈家。
