As a very rough rule of thumb, a price-to-rent ratio of less than 20 suggests that buying may be a good deal.

作为一个非常粗略的经验规则，价格与租金的比例小于20表明买房可能是一个很好的选择。

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As a rough rule, you might consider writing 3-5 pages single space for each question.

大致而言，你不妨每题写三至五页，单行间距。

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Under one rough rule, if the economy contracts for six straight months it is considered in a recession.

依据一项严格的规定，如果经济连续六个月收缩，则认为进入衰退期。

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But a rough rule of thumb is that a 10% depreciation adds 60-100 basis points to inflation, says Mr Chakraborty at Standard Chartered.

ECONOMIST: What the mini-run on the rupee says about India

Mr Mitarai told The Economist recently that he has a rough cut-off rule for allocating investment: anything for which labour comprises more than 5% of production costs can be done in China or some other low-wage country.

ECONOMIST: Manufacturing in Japan

The most competitive boats are the so-called meter classes, built according to a rule that sets the rough dimensions for vessels of each class.

FORBES: Old Gaffers