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。
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。
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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