Fire in the belly：A strong determination to succeed, ready to do something in a very energetic and passionate way. If you say that someone has fire in their belly, you are expressing approval of them because they are energetic, enthusiastic, and have very strong feelings. （一种激情似火、热血沸腾的状态）
以下是“Fire in the belly”在美剧《绝望的主妇》中的情景对话：
David：I’m sorry, where were we?
Gaby：You were about to turn me down, and then you reconsidered
——>> once you realized I was gonna throw a ton of money at you,
——>> which I am.
David：Ah It’s not about the money for me anymore, Mrs Solis.
——>> The fact is, if I don’t feel passionately about a client,
——>> if I don’t feel that fire in my belly,
——>> I don’t bring my A-game to court,
——>> and from what I’ve read,
——>> it’ll take my A-game to save your husband