“用完了”的英语可以翻译为：un out of，use up...

情况越来越糟糕，贮备物资也快用完了。Conditions are getting worse and supplies are running out.当时我们呼吸非常急促，很快就要把空气用完了。We were breathing really fast, and using the air up quickly.现在，这架飞机的燃料快用完了。By now the plane was running out of fuel....