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20.引用不同时代或时间点的谈话以切入主题
It used to be said that English people take their pleasures sadly.
过去人们常说英国人悲观享乐。
The relation between teacher and pupil is not what it used to be.
老师和学生之间的关系已不是以前那样了。
The monetary system of some countries used to be based on gold.
过去有些国家的货币制度是金本位制的。
As a wise man once said，“we are all ultimately alone.”
“我们都终将孑然一身。”一位智者曾如是说。
Someone once said，“Life is a do-it-yourself project.”
有人曾经说过，“生活就是一个自己动手的项目”。
Our beloved Premier Zhou Enlai once said：“Live and learn.”
我们敬爱的周总理曾经说过：“活到老，学到老。”