Informal To enlist oneself, especially as an employee:【非正式用语】 受雇：使自己受雇，尤其是作为一个雇员："Retired politicians often sign on with top-dollar law firms"(New York Times)“退休的政客经常受雇于一些有钱的法律事务所”(纽约时报)
To start transmission with an identification of the broadcasting station.宣布广播开始：在确认广播电台台名之后开始广播