Curve and uphill path resistance are great, linear resistance is little, declivous path still has quicken force.
曲线及
坡道阻力大,直线阻力小,下坡道
有
速力。
Curve and uphill path resistance are great, linear resistance is little, declivous path still has quicken force.
曲线及坡道阻力大,直线阻力小,下坡道有速力。
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