Charlie Nelson has nurtured fine sprinters.查理·纳尔逊已经培养出了相当优秀的短跑选手。Cheetahs , the champion sprinters of the animal kingdom , have non - retractable claws that give a similar advantage.猎豹是动物中的短跑之王, 它的脚爪是不能伸缩的,这给猎豹提供了类似的优势(译...
This paper introduces a rarely seen method of describing with diametral distance.本文介绍了一种鲜为人知的用直径距离描绘椭圆的方法.Meshing spur gears must have the same diametral pitch.互相啮合的直齿圆柱齿轮,必须具有相同的径节.Diametral pitch : the number of teeth ...
辐射产生于电子流的相干运动.The radiation is produced by the coherent motion of electron streams.阻止电子流前进的物质.The material which one is exhibited opposites current follow.导体切割磁场会产生电子流.Electronic currents appear when a conductor cuts mag...