飞机从一个地面信标到下一个信标曲折飞行，在每一阶段都要经过地面的许可才能上升和下降。

Planes must zigzag from one ground beacon to the next, and ascend and descend in steps at each stage obtaining permission from the ground.

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一位高级旅行顾问说，对于商务人士而言，如果他们在穿梭城市中心时，可以在三小时的火车旅程和一个小时的飞机飞行之间做出选择，他们会选择火车。

If businesspeople can choose between a three-hour train journey from city-center to city-center and a one-hour flight, they'll choose the train, says an executive travel consultant.

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让我们来看看一个对飞行器进行静力测试的一个涉密车间，这些测试是为了保证飞机在大载荷飞行状态下机体不破坏。

Let's visit a workshop with restricted access where static load tests of aviation equipment used to be performed. The tests ensured that the plane wouldn't be broken in the air due to heavy loads.

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