jìnrù / jiànzhù / gōngdì / bìxū / pèidài / ān quán mào / zhè / shì / jīběn / de / ānquán / guīdìng

进入建筑工地必须佩戴安全帽，这是基本的安全规定。

You must wear a safety helmet when entering a construction site, this is a basic safety regulation.