The work on IVF was driven by the desire to help infertile couples.
统计方法的目的是为从数据中得出结论提供合理的基础。
每一本书都是一次旅程,每一次旅程都是一本书。
Don't let anyone tell you that you can't do something.
Free education is abundant, all over the Internet. It's the desire to learn that's scarce.