rocket fuel          
noun [ U ] uk/ˈrɒk.ɪt ˌfjʊəl/ us/ˈrɑː.kɪt ˌfjʊəl/
 (促动某人做某事的)巨大动力,力量源泉
something that gives you energy or encourages you to do something, or that encourages something to happen
  The dawning realization that his childhood world was founded upon a lie provided the rocket fuel that propelled him into writing. 他逐渐意识到自己的童年世界原来建立在谎言之上,这种意识转化为巨大的动力,推动他投身写作。 
  烈酒;毒品
strong alcoholic drink or drugs
  A drop of rocket fuel eased the last few miles to the hostel. 喝一口烈酒,去青年旅舍最后几英里路也变得没有那么难走了。 
 In those days speed enjoyed a vogue as an energy-producing rocket fuel for naughty boys and girls to stay up and party all night.  在那些日子里,速度丸大受欢迎,被坏小孩当作力量源泉,整夜不睡开派对。 
 - More examples
 - For thrifts regulated by OTS, the option ARM was the rocket fuel of the mortgage boom.
 - "Payback is not a platform," says one of the party's top strategists, "but it can be rocket fuel in a campaign".
 - We've got less than four hours and I'm going to need some rocket fuel.