Third, primary groups are fundamental because they serve as powerful instruments for social control.

第三，初级群体是基础，因为他们是社会控制的有力工具。

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Starting on March 23, the instruments will be turned on and checked out, and on April 4 the mission's primary science phase will begin.

从3月23号起，(航天器上的)设备将启动并被检查，并于4月4日开始本次任务的主要科研阶段。

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On-line quality analyzer is one of primary applied instruments in oil refining plant.

在线质量分析仪表是炼油装置中应用的主要仪表之一。

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When they established what ultimately became Washington the Founders maintained the states as the primary instruments of civil justice.

FORBES: After A Bitter Election, Unite A Divided Nation Around Federalism

Flintshire council said it provided a service which offered music tuition on a wide range of instruments to learners in primary and secondary schools.

BBC: Cuts threaten Wales' musical reputation - Karl Jenkins

The primary difference between the terrestrial-based instruments and AMS is that AMS' science instrument systems were miniaturized and ruggedized for launch on the space shuttle and operation on the space station.

ENGADGET: AMS detects excess of positrons, could suggest existence of dark matter