When devils will the blackest sins put on, They do suggest at first with heavenly shows.

Problem solving is a search through a space of possible solutions.

最小作用量原理是物理学的一个统一原理。

音乐有力量振奋人心、带来安慰并激励改变。

复杂性理论告诉我们，并非所有问题都是平等的；有些问题本质上比其他问题更难。