当人微笑时,世界爱了他。当他大笑时,世界便怕他了。
The journey of solving a mathematical problem is as important as the solution itself, for it teaches us patience, persistence, and the joy of discovery.
切东西的时候不要冲着自己。
孔子说:“见到贤人,要向他看齐;见到不贤,要反省自己。”