In Europe, though, aircraft were often flown in different countries, and it soon became apparent that some kind of standard rules were needed.

而在欧洲，飞机经常在各国之间穿梭飞行，很快有人意识到，是应该建立某些规则了。

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We want to know some data (performance) of this kind of aircraft, such as.

我们相了解这种飞机的一些数据，比如。

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