at one's convenience
把书趁便给他带去。
Please take the book over to him when it is convenient.
趁便去看朋友
visit friends at a convenient time
趁暑假之便，我到北京去了一次。
During the summer holiday I went to Beijing once.
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。