underground railroad

• n. 地下铁道；(美国内战前)废奴主义者帮助奴隶逃跑用的地下逃亡道

underground railroad的英文翻译是什么意思，词典释义与在线翻译：

英英释义

Noun:

1. secret aid to escaping slaves that was provided by abolitionists in the years before the American Civil War

underground railroad的用法和样例：

例句

用作名词 (n.)

1. There was not an underground in Beijing before.
   北京从前没有地下铁道。
2. The construction of underground railways has eased traffic pressure on the ground.
   地下铁道的修建减轻了地面交通的压力。