抽象是数学的关键。
Abstraction is the key to mathematics.
The whole art of teaching is only the art of awakening the natural curiosity of young minds for the purpose of satisfying it afterwards.
解释:在人活动范围内的水就污浊,在野外无人地方的水就清洁。同为一样的水,都是从天边开源,有的混浊有的清洁,这是它们所处环境使它们这样的。
译文:学习、询问、思考、辨析、实践,都是做学问的方法,没有只学习而不实践的。
The power of cinema is in its ability to make us feel.
We are all just passing through, leaving only shadows behind.