用中文说: "Rule of thumb"
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Rule of thumb
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.
- It's a rule of thumb that I never walk into empty restaurants during meal time.
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.
Àn lǎo guījǔ, tā gěi ràng rénrén mǎnyì de fúwùyuán yī bǐ bù xiǎo de xiǎofèi.