They allow a certain amount of salt to enter their cells, bringing the salt content of the water within the plant, to a slightly higher concentration than that of the surrounding seawater.

它们允许一定量的盐分进入它们的细胞，将水中的盐分带进植物体内，并把其体内的盐含量提高到比周围海水稍高的浓度。

youdao

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。

youdao

Where the amount of the intermediate, or the concentration of intermediate, is low at all times. And doesn't change very fast.

中间产物的量，或中间产物的浓度，一直很低，不会很快的变化。

youdao

It said the detected arsenic concentration was twice the amount normally found in sludge.

BBC: Hungary sludge death toll rises after two bodies found

Given that those molecules are absorbed at different wavelengths, the machine can measure the amount of absorption and calculate the concentration of greenhouse gases in parts per million.

FORBES: Going For The Green: Measuring The London Olympics' Carbon Footprint

In his study, Rickard found that the amount of metal in the sludge depended on the concentration in the clothing - and this varied hugely.

BBC: Smelly socks raise silver stink