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
江苏热线英汉汉英双解词典包含207361条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。