开口 开口的英文 英语翻译 placket; start to talk; uncorkgapdebouch; debouchement 拓展翻译 开口扳手open spanner开口保险单open policy开口闭口whatever one speaks开口槽open slot开口端open end开口对焊open-butt weld开口管柱open tubular column开口罐open tank开口合同open-end contract开口环snap ring开口角angular aperture开口接头open connector开口链open link开口螺模split die开口皮带open belt开口器gag; mouth gag; mouth-gag开口式热交换器open-type heat exchanger开口销cotter; splitpin开口卸料压滤机open-discharge filter-press开口信用状open letter of credit