According to the range of lower explosive concentration limit, methods for how to set up warning region were research.

通过分析氨气扩散后爆炸浓度下限范围，探讨了如何设置警戒区的方法。

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Less than half of countries use the recommended blood alcohol concentration limit of 0.05 grams per decilitre as a measure to reduce drink-driving.

不到一半的国家使用所推荐的每分升0.05克血液酒精浓度限制措施，以减少酒后驾车。

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Gasoline vapor volatile developed to a certain concentration limit, just with the call, answer the process of sparking easily cause explosion.

汽油的油蒸汽挥发达到一定浓度极限，正好与拨打、接听过程中出现的火花极易引起爆炸。

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These are huge investments, even if their concentration in one rich corner of the Arab world will limit their impact.

ECONOMIST: A silent social revolution

Some providers of single-country ETFs address concentration risk by using a "modified market weighting" to limit their exposure to a country's giant stocks, or simply by focusing on stocks of smaller companies.

WSJ: Single-Country ETFs: Risky Ventures