Every lump of coal we mine keeps the lights on in someone's home.
The world is changed by your example, not by your opinion.
数学不是沿着一条清理得很好的高速公路小心行进,而是一次进入陌生荒野的旅程,探险者常常会迷路。
沟通中最重要的部分是听到未说出口的话。