如果你能听到脚步声，如果你的脚很用力地着地…如果你像我们在实验室说的发出砰砰的重击声，那么你正是在笨拙地跑步。
If you can hear your feet, if your feet are landing really hard... if you are thumping as we call it in my lab, then you're running poorly.
墨尔本研究人员发现，贪婪的袋鼠可能会被自己的大脚踏在地上时发出的重击声吓跑。
Researchers in Melbourne have found that these voracious marsupials can be scared off by the thumping sound of their own large feet on the ground.
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