什么是rules of thumb?

什么是rules of thumb? "rules of thumb"是什么意思 【原创】什么是‘rule of thumb’? All of us carry around rules of thumb about eating that have 这里rule of thumb the rule of thumb As a rule of thumb as a rule of thumb 是什么意思 rule of thumb的意思以及造句 that's usually my rule of thumb what do you think of china's thumb economy? 是lot of rules还是lots of rules