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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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.

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