英文公益广告

before it's too late 请住手吧，趁现在还不晚（环境）you can lose more than your patience 因为失去耐心而打孩子，你会失去比耐心更多的东西（家庭暴力）

NO SMOKING

Smoking is the biggest threat after the war,starvation and plague

公益广告 [名] public service advertising; [例句]魔术师约翰逊和姚明特拍的公益广告；Public service announcements featuring Magic Johnson and Yao Ming;

标准翻译1.Public Service Announcement 缩写为（PSA）2.Commonweal Ad.推荐第一种表达参见我以前回答