英语新词汇与常用词汇的翻译(U)—生命经纬 ... up in the air 悬而未决 up the creek 处于困境 up the pole 进退两难 ...
双语例句
1
The letdown back-pressure regulating valve maintains pressure in the section of letdown upstream or the letdown heatexchanger to prevent the letdown liquid flashing to steam.