C an activity or subject that you are interested in and excited about 感兴趣的活动；热衷的学科
Metaphor
Enthusiasm and excitement are like heat and a lack of enthusiasm and excitement is like cold or wet .
热情或兴奋就好比是热（heat），缺乏热情或激情就好比是寒冷（cold）或潮湿（wet）。
I haven’ t got any burning interest in modern art.我对现代艺术没有太强烈的兴趣。 It’ s the hottest show in town.这是城里最热门的演出。 Things heated/hotted up as soon as the music started.音乐一开始，气氛就热烈起来。 The audience was at fever pitch.观众极度狂热。 The book was received warmly.该书受到了好评。 He certainly has fire in his belly.他确实满腔都是火一般的热情。 She’ s always very sparky.她总是充满活力。 They seemed very lukewarm when I mentioned it to them.我在他们面前提起这事的时候，他们似乎很冷淡。 Her response to the suggestion was tepid.她给这项建议的反应是不冷不热的。 She poured cold water on all my suggestions.她给我所有的建议都泼了冷水。 The party turned out to be a damp squib.这个聚会结果令人大失所望。 He blows hot and cold all the time, and I never know where I am with him.他总是摇摆不定，我从来都不知道在哪一点我们的意见是一致的。