Curve and uphill path resistance are great, linear resistance is little, declivous path still has quicken force.
线及上坡道阻力大,直线阻力小,下坡道还有加速力。
Curve and uphill path resistance are great, linear resistance is little, declivous path still has quicken force.
线及上坡道阻力大,直线阻力小,下坡道还有加速力。
明：以上例
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