It is common practice to make a back-up file for our documents.

惯常做法是为正本另立一个后备档案。

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It is common practice to use a folder structure that reflects the namespace names.

使用反映名称空间名称的文件夹结构是一种惯例。

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The proportion of salt used also varies but it is common practice to use about 5 lbs. per 280 lbs. of flour.

用盐的配比也有差异通常做法是每280磅面粉约用5磅盐。

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Outside China, it is common practice to count the years from some starting date such as the introduction of the calendar by Emperor Huang-di.

FORBES: Chinese New Year Resolution: Get The Facts Straight

It is common practice for public services to mount in-house bids when offering contracts for public competition.

ECONOMIST: Letters

In Belgium, it is common practice for police not to comment on ongoing investigations which may be why the attack was not reported until now.

BBC: Nicholas Mockford: Belgian police hunt killers