If you or I buy it, it costs $51 per dose, you need three doses to be effective.

如果你或者我购买它,每支将花费五十一美元,你需要购买三支才会起效

耶鲁公开课 - 生物医学工程探索课程节选

And it's about my third or fourth week of graduate school and I'm pretty nervous about this.

那时，研究生学习才开始三到四周,我很紧张。

耶鲁公开课 - 心理学导论课程节选

We just launch the site three weeks ago.

我们三周前才开放了网站。

麻省理工公开课 - 媒体、教育、市场课程节选

The shortest term debt instrument in the United States is the Federal Funds Rate, which is an overnight rate--one day maturity-- and the longest issued by the Government is a thirty-year government bond, which will be repaid three decades in the future.

美国最短期的债券,是联邦基金利率,隔夜拆兑,一天到期,而时间最长的国债,是一种三十年期的政府债券,未来三十年才兑现

耶鲁公开课 - 金融市场课程节选