除非受恶劣天气干扰，南非邮船一般在星期五上午抵达。The South African mailboat arrived on Friday mornings unless bad weather intervened.我感觉那是对我们生活的一种干扰，让人感到荒唐可气。I felt it was a grotesque intrusion into our lives.当意外事件干扰了你的生活时，你会感到焦虑吗？Do you feel a...
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 ...