正是依靠观察和思考才能找到方法。所以我们必须不断挖掘和钻研。
It's on the strength of observation and reflection that one finds a way. So we must dig and delve unceasingly.
Every mathematical problem has a solution; the challenge is finding it.
真实的定义变成了:可以给出等价复制的东西……真实不仅是能够被复制的东西,而且是总是已经被复制的东西。