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拇指规则 /mǔzhǐ guīzé/ meaning in English

ChineseEnglish
拇指规则 /mǔzhǐ guīzé/ noun

rule of thumb(general guideline rather than a strict rule)
noun
[UK: ruːl əv ˈθʌm] [US: ˈruːl əv ˈθʌm]