And what you will give me in return is on the first day, one cent-- one penny; on the second day, two cents; third day, 4 cents... Every day, twice as much as the previous day, starting with one.

你们给我的是，第一天，一分钱;,第二天，二分钱，第三天，四分钱。,每天给我前一天的两倍钱，从一分钱开始。

哈佛公开课 - 幸福课课程节选

Do you think that one day we will be able to find an alternative energy?

你觉得有一天我们能找到替代能源吗？

对全球变暖的政策 - SpeakingMax英语口语达人