As more bacteria grow in an area, the amount of AHL increases, eventually reaching a concentration high enough to trigger behavioural changes.

由于一个部位细菌聚集地越多，AHL分泌地越多，最终其浓度将升高以达到激发群体效应。

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They estimate the average concentration of plastic in this area is about 4,000 pieces per square mile, though it is as high as 250,000 pieces per square mile in some places.

据他们估计，这一海域的塑料垃圾平均密度大约在每平方英里4000块左右，一些海域的密度最高可达到每平方英里25万块。

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They estimate theaverage concentration of plastic in this area is about 4,000 pieces per squaremile, though it is as high as 250,000 pieces per square mile in some places.

据他们估计，这一海域的塑料垃圾平均密度大约在每平方英里4000块左右，一些海域的密度最高可达到每平方英里25万块。

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Belgrave Road is known as the Golden Mile because of the high concentration of shops in the area selling gold jewellery.

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Washington now has the third largest concentration of high-income households of any metropolitan area in America.

CNN: On cuts, Washington throws a tantrum

It is the process of moving water from an area with a low concentration of dissolved material, such as salt, to a place with a high concentration, by passing through a membrane.

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