个别法

Modem hospitals are clean and safe and doctors can cure many diseases. But it was not always so. For a long time, health care was often dangerous and risky. Treatments were neither scientific nor effective, and many patients suffered deadly infection

发表于:2018-12-29 / 阅读(47) / 评论(0) 分类 人教全日制普通高中英语(必修)高三(全一册)

The raw sugar is first dissolved in water, and is then carefully strained to make it clear. It is next boiled in large pans until the water has nearly all passed away as steam. 首先把粗糖溶解在水里, 进行严格的过滤, 把糖水滤清。然

发表于:2019-02-13 / 阅读(66) / 评论(0) 分类 英国学生科学读本