教师的任务是引导学生从已知走向未知。

The most profound insights in mathematics often come from unexpected analogies.

生命中最美好的东西都是免费的。显然，我们最宝贵的资源是时间。

Sorrow can be alleviated by good sleep， a bath and a glass of wine.

A good book is an event in my life.

考验和冒险之间的区别在于你的态度。