The second paragraph: Next, the compilation of the shelter for extraordinary passengers and the basic methods of angle measurement is suitable for starting to develop commercial activities.
The third paragraph: Then, with the annual passenger flow of millions, the era of builders has come: many civil geniuses and a few electrical geniuses. At the same time, some farsighted people have tasted the benefits of reserving the necessary traffic land long in advance, although it was not very imaginable at that time. In Roissy, land was reserved in August 1960. At that time, there were only 2.7 million passengers in orly airport, accounting for about 4% of the total passenger flow in Paris today.
Paragraph 4: The airport has gradually become a complex system in air traffic. Today, airport managers and those responsible for controlling air traffic constitute an increasingly important part of the development and operating costs of airlines.
I'm sorry that my level is limited and I can't be very satisfied.