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.

youdao

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.

youdao