Security force
un. 〔軍〕警戒部隊；保安部隊\\n
?? 詞語組成解析
force
[f?:s]
n. 力;武力;（社會）勢力;魄力;
vt. 強迫;強行;促使，推動;強奸;
??? 情景例句
That's relief.
真令人欣慰。
Little children have the most fun playing make-believe.
兒童很喜歡幻想的游戲。
On motorways you can, at least, travel fairly safely at high speeds,
在公路上還好，你至少能以相當快的速度安全地向前行。