1. It is said that the world would run out of fresh water in 2050. 据说到2050年世界上的淡水将会耗尽。
2. Soon, the money began to run out and they couldn't afford the lessons anymore. 很快,钱被用完了,他们再也负担不起这些课程了。
3. I have learnt that the problem of air pollution is universal and that we were likely to run out of some natural resources. 我了解到空气污染问题是全球性的,而且我们可能会耗尽一些自然资源。