来吧，一旦你觉得自己懂得了什么，就必须换一种角度来看。这可能显得很荒唐或者愚蠢，但必须试一下。
Come on.Just when you think you know something, you have to look at it in another way. Even though it may seem silly or wrong, you must try.
免费的疫苗比昂贵的治疗更有价值，但更难推广。
My dad was my best friend and greatest role model.
Chemistry is not just a science—it’s a way of thinking.