verb · to release or vent waste gas into the atmosphere

化工厂被禁止向大气中直接排空有害气体。

to drain out or completely empty a space or container

在进行维修工作之前，必须先将油箱排空。

verb · to surge or rise high up into the sky, often describing waves or clouds

江面上浊浪排空，气势非常磅礴。