Don't be lazy, the older you get, the harder it will be to learn.
别偷懒,年纪越大,学起来就越难。
A true friend is known in the day of adversity.
疾风知劲草,患难知友情。
John Dewey has said in all seriousness that the part played by custom in shaping the behaviour of the individual,as against any way in which he can affect traditional custom,