extracting caffeine

• 提取咖啡因

extracting caffeine的用法和样例：

例句

1. The expensive processes currently used to extract caffeine from normal beans also strip other flavour compounds from the coffee.
   现行的从咖啡豆中提取咖啡因的方法花费不菲同时也会去除咖啡中的其它味道。