freeway 什么意思?

freeway 什么意思? freeway什么意思 highway/ expressway/ thruway /freeway有什么区别? freeway.highway .expressway.这些都有什么区别,谁给讲讲 gulf freeway 是什么路 为什么高速公路叫freeway? expressway和freeway的区别? highway,freeway,metro,subway区别 highway superhighway interstate freeway expressway turnpike有 superhighway,freeway,highway,expressway 有什麼分别? 为什么高速公路的英文叫freeway? The heavy fog was____a series of freeway traffic accidents e