光滑的冰面对于物体——譬如在冰面上拖曳的冰刀——施加极小的摩擦阻力。

Smooth ice provides very little resistance against objects, like ice skates, being dragged across its surface.

youdao

保持身体在一侧的姿势产生的拖曳阻力相对保持身体水平的姿势来说是一样的，不多也不少。

Holding the body on the side produces no more or no less drag resistance than holding it prone in crawl or backstroke.

youdao

根据试验结果和建立的运动方程，获得阻力系数与圆管形状的关系，并计算了圆管所受到的拖曳力。

Based on the test results and movement equation established, the relationship between drag coefficient and tubular shape is obtained and the drag force imposed on pipe is calculated.

youdao