数学的进步是通过不断质疑已建立的真理来实现的。

And let's be clear: It's not enough just to limit ads for foods that aren't healthy. It's also going to be critical to increase marketing for foods that are healthy.

种一棵树最好的时间是二十年前，其次是现在。

The future of food security lies beneath the waves—if we dare to farm it responsibly.

有时候你必须先输才能赢。