if by any chance
⇒ 万一他不在,把信交给他的秘书。
If by any chance he isn't there, give the letter to his secretary.
contingency
英语词典包含298861条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。