common carrier

common-carrier的词性：
n.（名词）

1. One that is in the business of transporting the public, goods, or messages for a fee.
运输业者：为酬金从事输送民众、货物或文件的人

2. A company that provides telecommunications services, as by telephone or satellite, to the public.
电讯公司：对群众提供电讯服务的公司，如经由电话或卫星