The oarsman found that the he had to pull against the tide.
划桨者发现他必须逆水划船。
Like any natural force, gravity pull can work with us or against us.
习惯的引力如同自然界所有的力量一样，可以为我们所用，也可能危害我们。
Like any natural force, gravity pull can work with us or against us.
与其他自然力一样，地心引力对我们而言，是助力，亦可是对抗力。
The horse felt the pull and struggled with all its power against the mud.
马感觉到拉力，尽全力要从泥泞中挣出。
The horse felt the pull and struggled with all its power against the mud.
马感觉到拉力，尽全力要从泥泞中挣出。
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