"The difference between correlation and causation is fundamental in empirical work."
群星不会因为像萤火虫而怯於出现。
The pursuit of mathematical knowledge is a journey that never ends, filled with endless curiosity and wonder.
一个人固守道德而不能发扬光大,信仰主张又不能坚定不移,这种人有他不能算有,没有他不能算无。