the Underground Railroad
/ði ˌʌndəɡraʊnd ˈreɪlrəʊd/
/ði ˌʌndərɡraʊnd ˈreɪlrəʊd/
- a secret system used in the US before the Civil War for helping thousands of slaves to escape to the free northern states or Canada. The slaves were called 'passengers', the people who helped them were 'conductors', and the slaves hid in 'stations' (safe houses) along the way.
地下铁路：内战之前在美国使用的秘密系统，用于帮助成千上万的奴隶逃到北部自由州或加拿大。奴隶被称为“乘客”，帮助他们的人被称为“指挥”，奴隶一路藏在“车站”（安全屋）中。