水的纯度定期检测。The purity of the water is tested regularly.要求学生们检验铜的纯度.The students are asked to prove the purity of copper.我们可以保证它的纯度.We can guarantee it pure....
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...