Seventy years ago one of the greatest amphibious assaults in history was launched from here on the south coast of England. And within a matter of hours, 7000 vessels had landed 156,000 troops on the beaches of Normandy. It was a manoeuvre that changed the course of the war and tested innovations in science and engineering for the first time. On this programme, engineer Rob Bell...$比较简略,其实可以做成系列解释得更细致$讲的太简略了、。。。$建议与Normandy 44'一同看。