in-service 前面那个in-是嘛意思啊?in-service training organizations 整句

“为服务”是in service 还是for service? in the service in-flight-service是什么意思 death in service是什么意思 be in the service 与be in service的区别 be in service 造句,速度! 英语翻译“in-service training”和“on-the-job traing”有啥区别? Parts Only Warranty (Carry-In Service)什么意思 be in use/service的中文翻译是什么啊? there is____waiter service in a pub. .do you .the service in that restaurant to be in/out of service是什么意思