机场工作人员通宵工作，清理主跑道上的积雪。

The airport staff worked overnight to clear the snow from the main ___runway.

由于能见度低，飞机冲出跑道并导致了一起小事故。

Due to poor visibility, the aircraft overshot the ___runway and caused a minor incident.

修建一条更长的跑道对于机场处理国际航班至关重要。

The construction of a longer ___runway is essential for the airport to handle international flights.