数学不仅仅是关于数字、方程、计算或算法:它是关于理解的。
导师的职责是指导孩子的智能活动和孩子的心理。
Sorrow can be alleviated by good sleep, a bath and a glass of wine.
Today is cruel, tomorrow is crueler, and the day after tomorrow is beautiful, but most people die tomorrow night, so don't give up today.