The French constructed a series of fortresses from Dunkirk on the Channel coast to Douai.法国人在从敦克尔刻到杜埃的英吉利海峡沿岸修筑了一系列要塞。The French constructed a series of fortresses from Dunkirk on the Channel coast to Douai.法国人在英吉利海峡沿岸的敦克尔刻到杜埃修筑了一系列要塞。We have seen the capitulation of towns, of celebrated fortresses, of states.我们目睹了城镇、著名要塞以及国家一个个相继投降。