解释：知道房屋漏雨的人在房屋下，知道政策有失误的人在民间，知道经书错误的人在诸子。

凡是创作古文，必须推究前代文章的本意，以此展现自己的学问。

The most significant threat to liberal democracy today is not from rival ideologies like communism or fascism, but from within—from the rise of populism and the erosion of democratic norms.

The future of coal depends on our ability to innovate and reduce its environmental impact.

历史学家是回望过去的先知。