Reflection of a beam of light on the diaphragm falls on a phototransistor.经膜片反射的光束照射到光敏管上.A beam of light produced by a laser can weld metals.激光器发生的光束可以焊接金属.A beam of light produced a laser can weld metals.激光器发生的光束可以焊接金属...
Many of their cheeses are exclusive to our stores in Britain.在英国，他们生产的奶酪很多只在我们商店出售。The vast majority of our cheeses are made with pasteurised milk.我们生产的绝大部分奶酪都是用巴氏消毒过的牛奶制成的。a wide and varied selection of cheeses种类繁多的可供选购...