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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This paper presents the on line measurement of size, concentration and velocity of pulverized coal with light fluctuation and correlation method.

该文介绍了结合光脉动法和相关测速法同时在线测量煤粉粒径、浓度和速度的技术和装置。

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

FORBES: Curiosity Sniffs The Martian Atmosphere But Finds No Sign Of Life

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

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

FORBES: Magazine Article