生铁可含百分之四的碳.Pig iron may contain 4％ of carbon.独立战争前夕，北美十三州每年生产3万吨生铁。On the eve of the Revolution, the colonies produced thirty thousand tons of crude iron a year.并非一概如此 — 例如从低级铁矿石中生产生铁和钢材的情况一但是这导致了工业发展集中在煤田上.This is not a...
一片赞成声在乌克兰议会中回响。A roar of approval resounded through the Ukrainian parliament.那位年轻女医生的话在他耳畔回响。The words of the young woman doctor echoed in his ears.从松林深处传来一声回响。Somewhere in the depths of the pine forest an identical soun...