For systems, the analogue of a face-lift is to add to the control graph an edge that creates a cycle, not just an additional node.

海洋养育了数十亿人，我们有责任确保它在未来几个世纪继续这样做。

有些时候你必须去挑战伟大。。

The essence of computational thinking is abstraction and automation.

同理心是创新的关键。