People are afraid to pursue their most important dreams, because they feel that they don't deserve them, or that they'll be unable to achieve them. We, their hearts, become fearful just thinking of loved ones who go away forever, or of moments that could have been good but weren't, or of treasures that might have been found but were forever hidden in the sands.

时光飞逝，应珍惜每一刻。

Behavior is not just a response to a stimulus, but is guided by expectations and purposes.

The world is built on chemistry, and we are just beginning to see how.

跨国合作是解决全球粮食安全挑战的关键。