Humor must not professedly teach and it must not professedly preach, but it must do both if it would live forever.

Humor must not professedly teach and it must not professedly preach, but it must do both if it would live forever.

幽默不能只讲说教，也不能只讲说教，但如果它想永远存在，就必须两者兼备。

-- Mark Twain 马克·吐温