1.He'll observe whether you're overpronating (your foot rolls inward) or supinating (your foot rolls outward) when your foot strikes the ground.
在你脚着地时他会观察你是否是过度足外翻（你的底辊向内）或者是内翻（你的底辊向外）。
2.He'll observe whether you're overpronating (your foot rolls inward) or supinating (your foot rolls outward) when your foot strikes the ground.