英语词汇“an underground railroad”的翻译、意思、用法、释义-英汉汉英双解词典

词汇	an underground railroad
释义	an underground railroad 反对奴隶制者帮助南方奴隶潜逃到北方或加拿大的秘密组织
随便看	counter current multiplication counter-current multiplication countercurrent multiplication mechanism counter current multiplication mechanism counter-current multiplication mechanism countercurrent multiplier countercurrent multiplier system counter current multiplier system counter-current multiplier system counter-current multistage extraction counter current multi-stage extraction counter-current multi-stage extraction countercurrent network countercurrent nitration counter-current nitration countercurrent operation counter current operation counter-current operation countercurrent packed column countercurrent pan mixer countercurrent percolation system countercurrent pipe exchanger counter-current pipe exchanger counter-current principe countercurrent principle