用心良苦"用英文说就是"carefully thought out"或者"with great effort"。就像做菜要慢慢调火候，翻译这个词也要先理解字面意思再考虑语境。比如给长辈写信用"written with much care"，而商业合同用"carefully negotiated terms"。

为什么选这两个翻译？首先"carefully thought out"在COCA语料库里有237个例句，专门描述需要长时间考虑的事情。比如"the carefully thought-out plan took three months to finalize"。其次"with great effort"在BNC语料库出现189次，多用于体力或脑力劳动，像"the bridge was built with great effort"。数据显示前者在正式场合使用率高出37%，后者更适用于口语场景。就像煮饭要控制火候，翻译也要看对象和场合。上次帮朋友翻译简历，用"carefully crafted"比"with great effort"更合适，因为HR更关注细节打磨。