to be on the alert
吃东西要留神。
Be careful when eating.
过马路要留神。
Watch out when crossing the street.
同他相处可得留神
you really need to be careful around him
汉译英翻译词典收录86165条汉英翻译词条，基本涵盖了全部常用中文字词的英语拼写、翻译、音标、读音、用法、例句等，是英语学习的有利工具。