The mediocre teacher tells. The good teacher explains. The superior teacher demonstrates. The great teacher inspires.

The mediocre teacher tells. The good teacher explains. The superior teacher demonstrates. The great teacher inspires.

平庸的老师说。好老师解释道。优秀的老师示范。伟大的老师鼓舞人心。

-- William Arthur Ward 威廉.亚瑟.沃德