thumb rule meaning in English

计算中近似法
经验法则
经验方法
经验规则
右手定则

As a thumb rule a questionnaire shall not contain more than 10 - 15 qs
通常，一个问卷表包含的问题不超过10 - 15
Time - tested methods are illustrated with humorous anecdotes and memorable thumb rules
经过时间考验的方法，给出了与幽默的奇闻轶事以及令人难忘的拇指规则。
As a thumb rule , responsive course of the erythrocyte immunity to acute incremental exercise could be divided into three phases : activation , compensation and restoration
表明此种运动条件下，红细胞免疫功能经历激活阶段、补偿阶段、复归阶段的变化规律。 3
Most of the thumb rules like use of open questions , restatement for confirmation of understanding , clear agenda definition , use of designated scribes , etc . are also applicable here
首要的技巧象提一些开放性问题，复述回答来确认理解，建立清楚的议程，指定记录员记录会议等都可使用。
In the silicon valley of usa , there is a very popular ” big thumb rule ” , which means ten portfolio company that venture capital investing institution makes investments into , three are losing , three are surviving , three get into ipo process and the venture capital earns not bad , only one can get excellent success
在美国硅谷,有一个广为流传的“大拇指定律” : 10个由创业投资机构支持的创业企业中,有3个是失败, 3个是勉强生存,还有3个能够上市并有不错的市值,只有1个能够脱颖而出。