飞机舷窗为何是圆形的

While not everyone will have pondered the subject while staring out of the window during a flight, the question as to why aeroplanes have circular windows rather than square ones is interesting., ,虽然不是每个人都会在飞行中凝视窗外的时候思索一个问题：为什么舷窗是圆形的而不是方形的 。但这个问题很有趣
。, ,Over the years, aerospace ¹ engineering has made huge leaps in aeroplane technology, meaning planes can carry more passengers and go faster. The planes have also changed shape to increase safety – including the windows., ,In the 1950s, when jetliners were starting to become mainstream ², the De Havilland Comet[1] came into fashion. With a pressurized cabin, it was able to go higher and faster than other aircraft., ,However, the plane had square windows and in 1953 two planes fell apart in the air, killing ³ 56 people in total., ,The reason for the crashes? The windows., ,Where there's a corner, there's a weak spot. Windows, having four corners, have four potential weak spots, making them likely to crash under stress – such as air pressure., ,By curving the window, the stress that would eventually crack the window corner is distributed and the likelihood of it breaking is reduced.