仪容整洁和个人卫生的考究已经行之有年了。
因为习惯的养成已行之有年，无法瞬间被改变。
They've been established over years, so they can't change in a snap.
自洁式表面的销售主张相当明确不说，事实上汽车及窗户用的自洁涂层已经行之有年。
The selling proposition of a self-cleaning surface is obvious and in fact self-cleaning coatings for cars and windows have been around for years.
但如果已经有现成的解决方案，有创意的人也总能找出方法，加强或改进这些行之有年的方案。
Alternatively, if a solution to the problem already exists in one form or another, highly creative people will find ways to enhance and improve on the solutions which have been used previously.
但如果已经有现成的解决方案，有创意的人也总能找出方法，加强或改进这些行之有年的方案。
Alternatively, if a solution to the problem already exists in one form or another, highly creative people will find ways to enhance and improve on the solutions which have been used previously.
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