be up的意思
问题描述：
be up的意思
句子：But after the first batch of trains were up and running,judging by their performance and the service afterwards,we were confident in placing a second order.请问这句话中的were
答
be up 不是重点,重点是 up and running 才是一个词组,up and running = operational,就是运转的意思.,下面也有人提到.