数学不是观赏性运动，你必须参与其中才能理解。
Mathematics is not a spectator sport; you have to play to understand.
I don't count my sit-ups. I only start counting when it starts hurting.
直到被完全理解，过去才真正成为过去。
In mathematics, truth is somewhere out there in a place we don’t yet know, and the only way we can hope to find it is by exploring.
钢铁行业必须拥抱可持续性，否则就有被淘汰的风险。