| 词汇 | rule of thumb | 
| 释义 | rule of thumb idiom   C1 实用的估测方法;经验之谈;经验法则 a practical and approximate way of doing or measuring something  A good rule of thumb is that a portion of rice is two handfuls. 有个方便实用的估算方法,即两把生米便是够一人吃的量。  | 
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