"Twice" or "double" in Engpsh can both be used to express "两倍" in Chinese. Here are a few examples:

"I need twice as much flour as the recipe calls for." (我需要的面粉是食谱所谓的两倍。)
"I earn double my previous salary at my new job." (我在新工作中赚到了我以前工资的两倍。)
"The ticket price for the concert has been doubled." (音乐会的票价已经翻了一番。)