交换力的条件与同位旋完全无关.The condition of an exchange force has nothing to do with isospin.同位旋是矢量.Isospin is a vector quantity.由激光发射出的光线都是同位的.All rays leaving the laster are in phase....
He sounded so posh on the phone.在电话里听起来，他的谈吐非常优雅。She always puts on a posh voice to talk to the vicar.她总是装腔作势,用一种优雅的嗓音跟教区牧师讲话.Now he's got a posh car, he thinks he's arrived.现在有了豪华汽车, 他想他已经功成名就了....
A fishing vessel and a cargo ship collided in rough seas.一艘捕鱼船和一艘货船在波涛汹涌的海上相撞了。Despite the poor weather the fishing has been pretty good.尽管天气恶劣，却渔获颇丰。He flashed his light into the boat and saw the fishing-line.他朝船上照去，看见了...
他们正好踩上了饵雷，结果被炸得粉身碎骨。They walked right into a booby-trap and got blown to smithereens.他们在小路上挖深沟设饵雷。They dug trenches in their path and set booby traps.警察在这个地区探测饵雷。Police were checking the area for booby traps....