The girl stared at the ground and looked uncomfortable, but she didn’t answer.
这个女孩盯着地面,看起来不舒服,但她没有回答。
Answer: Running on a treadmill feels somewhat easier physically because the ground is being pulled underneath your feet and there's no wind resistance.
答案:在跑步机上跑步身体或多或少感觉轻松些,因为你脚下的地面被往后拉了,而且没有风的阻力。
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