The pilot was given clearance to land by air traffic control.
飞行员得到空中交通管制站发出的着陆许可。
They have to wait for clearance from air traffic control.
他们必须等待空中交通管制队下达的起降许可令。
Owing to the heavy air traffic, we'll wait until a take-off clearance is given.
由于空中航路拥挤，我们要等待通行许可才能起飞。
Owing to the heavy air traffic, we'll wait until a take-off clearance is given.
由于空中航路拥挤，我们要等待通行许可才能起飞。
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