“下决心”的拼音为：xià jué xīn...

“下决心”的英语可以翻译为：make a firm decision，be resolute，be determined to，make up one's mind，brace up ...

我下决心有些慢。I've been a bit slow in making up my mind.我正下决心准备去拜访时，西蒙来了。I was steeling myself to call round when Simon arrived.机不可失，下决心吧。It's now or never, so make up your mind....