Idea: In case the failing expression is known to legally make reference to a thing that's at times null or lacking, either specify a default benefit like myOptionalVar!＆家电维修：卫浴维修、热水器维修、空调维修、电视维修、冰箱维修、洗衣机维修、油烟机维修、燃气灶维修等多种维修服务。【家电�