It's an old practice.

这是一种古老的习俗。

youdao

The trouble with the old practice of suing people for swapping music is that it is slow, expensive and limited.

起诉交换音乐的老方法有诸多如缓慢、昂贵、有限的麻烦。

youdao

Bruce's mission is to get publishers to change this 70-year-old practice (it started in the Depression of the 1930s).

Bruce的目标就是让出版商改变这个有70年历史的惯例(始于20世纪30年代的大萧条时期)。

youdao

With much of the tribal region dominated by several Taliban factions, the government is turning to an old practice of striking agreements with local tribal militias, called lashkars,to handle security.

VOA: standard.2009.03.26

In fact, there are some very old books that show this as the average, the sum divided by two arithmetic mean, but the modern practice is to use the geometric mean.

事实上，一些很老的书籍上,平均的定义就是算数意义的，总的来说被分为两种算数意义，但现代我们多用几何意义。

麻省理工公开课 - 固态化学导论课程节选

Few customs offer as much insight into someone's personality than the age-old practice of tipping.

FORBES: Magazine Article

The old practice of grading concussions to predict recovery times is now a thing of the past.

FORBES: Safety Prevails -- In Updated Guidelines To Manage Concussions

If this is perceived as unfair, would you prefer the old practice of administrative suasion and regulatory forbearance?

ECONOMIST: Modernising Moldova