On-line concentration techniques have been employed more and more in many analytical areas over the past decade due to their advantages of simplicity, automation, low cost and high sensitivity.

样品在线富集技术是一种提高方法灵敏度的方法，由于其操作简便、成本低、自动化程度高、易于实现等优点，得到了越来越广泛的应用。

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They continue to manipulate various factors, such as concentration and frequency, vainly trying to draw a parallel line between the animals and humans when there isn't one.

他们继续控制各种因素，如浓度和使用次数，妄图在动物和人类之间做比较，而这种可比性是不存在的。

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Keeping track of these time shifts takes concentration, since theauthor will sometimes deliberately blur the line between war as grand drama andwar as farce.

因为(读者)时刻追溯时间的转变要花费很多精力，所以，作者有意地不时模糊战争的宏伟场景和战争闹剧之间的界限。

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The low concentration of methane is in line with other studies of the Martian atmosphere performed by other instruments.

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Then, fingering the line, he waits, with a monk's tireless patience and the concentration of a chess player.

FORBES: Magazine Article

We linked in concentration, and it occurred to me that the delicacy of the line and the fine movements needed to free it appealed to him the way drawing appealed to him, because of their beauty and precision.

NEWYORKER: The Other Place