When we talk about food security, we're really talking about national security.

I don't think about how many records I'm selling. I just think about the music.

数学的美在于它能够用一种超越文化和语言障碍的语言来描述宇宙。

信任是任何成功企业的基础，尤其是在能源行业。

自然实验可以为经济问题提供有价值的见解。