经济发展理论研究的是经济系统如何产生不断改变它的力量。

I believe in pink. I believe that laughing is the best calorie burner. I believe in kissing, kissing a lot. I believe in being strong when everything seems to be going wrong. I believe that happy girls are the prettiest girls. I believe that tomorrow is another day and I believe in miracles.

Collaboration across disciplines is essential for solving complex scientific challenges.

数学不是沿着一条清理干净的高速公路小心翼翼地行进，而是一次进入陌生荒野的旅程，探险者常常会迷路。

Every book is the wreck of a perfect idea.

我不相信运气，我相信准备遇上机会。