字典裡查到的：
a rule of thumb:
a simple practical rule that helps you in doing something.
EX: A good rule of thumb is to restrict yourself to one or two typefaces
in your documents.
※ 引述《kino818 (有夢不能實現)》之銘言：
: as a rule 是"通常"
: 那as a rule of thumb呢?
: 都查不到
: thx
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