Your peripheral vision may not be all that good for watching a fast moving table tennis ball onto a relatively small racket head.
你的余光也未必那么好，能看着一些如此快速运动的小乒乓球到达一个相对较小的拍头上。
The photos show an animal with a relatively small head topped by large fleshy, collar-like fins.
照片中的动物脑袋相对较小，头部下面长了许多像衣领一样的肉鼓鼓的鳍。
The method disturbs the flow pattern relatively less and the water head loses in small.
此补强方法对水流流态干扰较少， 水头损失小。
应用推荐