The swingswitch hand drag was designed to counter the engrained habit some swimmers have of sweeping their recovering hand through the air in an arc above them.
的swingswitch方面拖了计数器的根深蒂固的习惯有些人已经全面恢复一方面通过空气在上面一个弧。
On the other hand, plant products like Manila hemp, you can drag through the ocean for weeks on end.
另一方面,像马尼拉麻这样的植物产品,你可以连续好几个礼拜拖着它们穿过海洋。
Less surface area means less drag, and less drag means more fuel efficiency. Kevin hand.
较少的表面面积意味着较少的阻力,相应地提高了燃油效率。
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