rule of thumb
US /ruːl əv θʌm/
UK /ruːl əv θʌm/
1.
經驗法則, 粗略的估計
a broadly accurate guide or principle, based on experience or practice rather than theory
:
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As a rule of thumb, always save at least 10% of your income.
作為經驗法則，至少要存下你收入的10%。
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A good rule of thumb for cooking rice is two parts water to one part rice.
煮飯的一個好經驗法則是兩份水配一份米。