Biology suggests that beauty may be a good rule of thumb for

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Biology suggests that beauty may be a good rule of thumb for accessing someone of either sex.
这边a good rule of thumb怎么理解啊

拇指原则（a rule of thumb）
拇指原则（a rule of thumb）：单靠经验或实践的方法,粗略而简便的方法 .
该语的字面意思是“大拇指的规则”,实际意义为“（根据实际经验和实践的）对事物粗略但实用的估计方法”.
其出典有两种说法：
一说源自旧时用拇指大略计算长度的做法.
另一种说法源自昔日酿酒工人将拇指浸在所酿酒中估计温度的做法.

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