sky marshal
noun [ C ] uk/ˈskaɪ ˌmɑː.ʃəl/ us/ˈskaɪ ˌmɑːr.ʃəl/
空中便衣警官
an official person dressed in ordinary clothes, who carries a gun on an aircraft and whose job is to protect other passengers
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。