NO.2
You're on fire不是你起火了！
fire还能表示情绪热情
fire的第二个意思是：strong emotion；
精神状态好
例句：
Man， you're on fire！
天啊，你状态真不错！
（非常热情）
（火力全开，根本停不下来）
NO.3
Play with fire真的是“玩火”吗？
玩火一般形容从事有巨大风险，
不理智的事情
英文中，
play with fire 和中文意思差不多
play with fire 的意思是： to act in a way that is very dangerous and to take risk. 冒着风险从事危险的行为
例句：
Dating the boss's daughter is playing with fire.
约会老板的女儿，这简直就是在玩火
NO.4
Have irons in the fire
iron=铁
Have irons in the fire不能按字面意思翻译
have (a few)several irons in the fire的意思是：to be involved in several different activities or have serveral plans all happening at the same time.同时有好几件事情要做
例句：
Don't bother her because she has many irons in the fire.
別打扰她，她事情太多，忙得很！
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