副载波
sub carrier monitoring instrument 副载波监测仪表
I had to sub for the referee, who was sick. 裁判病了，我得代为裁判。
Your carrier for this flight is British Airways. 你的这一班机是英国航空公司的飞机。
The missile was launched from the aircraft carrier. 导弹是从航空母舰上发射的。
The commercial carrier is doing a lively business. 那家商务运输公司业务繁忙。
