当他们着地时，一切就开始消失了。
当一些人声称在重心之下着地时，录影带并不支持他们的说法。
When we look at videos of people who self-report that they're running under their center of gravity, the videos don't support them.
当一些人声称在重心之下着地时，录影带并不支持他们的说法。
When we look at videos of people who self-report that they're running under their center of gravity, the videos don't support them.
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