想指挥乐队的人必须背对人群。

Every challenge in the quarry is an opportunity to innovate.

记忆是脆弱的，但故事使它永恒。

Sustainability is not an option; it's a responsibility we owe to future generations.

数学推理可以相当系统地看作是对两种能力的结合运用，我们可以称之为直觉和独创性。