用中文说: "Rule of thumb"

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Rule of thumb

【中文】凭经验、按老规矩

   Píng jīngyàn, àn lǎo guījǔ

【解释】 A means of estimation made according to a rough and ready practical rule, not based on science or exact measurement.

【例句】

- It's a rule of thumb that I never walk into empty restaurants during meal time.

 凭经验，我在饭点时从不进那些空馆子。

 Píng jīngyàn, wǒ zài fàndiǎn shí cóng bù jìn nàxiē kōng guǎnzi.

- As rule of thumb, she gave a handsome tip for the waitress who served everybody to the heart's content.

 按老规矩，她给让人人满意的服务员一笔不小的小费。

 Àn lǎo guījǔ, tā gěi ràng rénrén mǎnyì de fúwùyuán yī bǐ bù xiǎo de xiǎofèi.