Backflow prevention assemblies MUST be installed by a licensed journeyman tradesperson, who is recognized by the authori防回流阀总成必须由有资格证书的熟练技术人员安装，安装人员必须通过有关主管部门的认可，并符合当地安全规程的要求。
Otherwise, you may end up with a troop of journeyman actors for whom this will be the highlight of their career.因为如果那样的话，你会以一群不知名演员而结束游戏，而这将成为他们职业生涯的亮点。