Standby什么意思

Should Be应该,应该 Southbound (traffic/transportation)(交通、交通等)南行 Standby备用 Switch Board交换台 Sand Blastvt. 喷砂法 Starting Bid (trade)投标(交易)开始 Signal to Background (ratio)背景(率)的信号 Seen By (UK medical reporting)医学报告被(英国) swing/by秋千/ Soil/Bentonite膨润土