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

in-service 前面那个in-是嘛意思啊?in-service training organizations 整句是嘛意思? in-service In-house Service是指上门服务吗? death in service是什么意思 in-flight-service是什么意思 in the service Variability in service “为服务”是in service 还是for service?“为服务 尽善尽美”用英语怎么说 be in the service 与be in service的区别 be in service 造句,速度!我要的是造句！！ Maybe you can j____ in our school concert 那个横线前面的j是首字母 年份前面是用on还是in? 那些单词前面有in是单词前面,大小写都行 .do you .the service in that restaurant to be in/out of service是什么意思 Maybe you can b____ in our school concert 解释下额~那个横线前面的b是首字母 in the后面跟day那为什么at后面跟night?白天和晚上前面的那个为什么不一样?一个是in the一个是at? master in financial service和master in finance 的区别