我们的家中和学校里如今已有洁净水源和卫生条件好的厕所。
The vast source of water could one day be used to generate oxygen or sustain a moon base.这个巨大的水源也许在未来的某一天可以用来制造氧气或者维持月球基地用水。
By then, however, Mulholland had turned his attention east to the Colorado River as another potential source of water for Los Angeles.不过,那时穆赫兰已经将注意力转向科罗拉多河,将那里作为洛杉矶潜在的水资源。