The past is a foreign country; they do things differently there.

每一个挑战都是伪装的机遇。

A novel is not just a story; it is a constructed object, an artifice that must be as perfect as possible.

估计问题的性质不同。在这里，我们不关心检验特定的假设，而是关心估计参数的值。

时间是最好的作者：它总能找到一个完美的结局。