The mediocre teacher tells. The good teacher explains. The superior teacher demonstrates. The great teacher inspires. -William Arthur Ward.

普通老师照本宣科，好老师解疑答惑，超级棒的老师躬亲示范，伟大的老师点拨引路。——美国作家威廉•亚瑟•沃德。

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The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails---William Arthur Ward, American author.

悲观者抱怨有风，乐观者期待风向改变，现实者调整风帆---威廉。阿瑟。沃德，美国小说家。

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