The measles is caused by a kind of specific epiphyte.麻疹是由一种特殊的真菌引起的.The strategy involved too douses ( two doses ) of measles vexing ( vaccine ) with supplements of vitamin A.提高麻疹 免疫 的策略还包括两种加有维他命A添加济的疫苗.The doctor told ...
Ozone is a highly reactive form of oxygen gas.臭氧是一种非常活跃的氧气形态。Ozone is produced by the reaction between oxygen and ultra-violet light.臭氧由氧气和紫外线发生反应而产生。Carbon, hydrogen and oxygen combine chemically to form carbohydrates a...