Many systems are designed at three primary levels: system, subsystem, and component, as shown in Figure 1.

许多系统是在三个主要层次上设计的：系统、子系统和组件，如 图 1 所示。

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There are three primary reasons to create Value Stream Maps: objectivity, clarity, and persuasion.

创建价值流图主要有三个原因：客观性，清晰性以及说服力。

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Figure 2 below shows the interaction between these three primary XML files and their constituent parts.

下图 2 显示了这三个主要的 XML 文件与它们的成分部件之间的交互。

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At the week-long conference, participants are focusing on three primary roadblocks to getting and keeping girls in school: violence,poverty and the poor quality of education being offered.

VOA: standard.2010.05.19

During Grail's three-month primary mission, the spacecraft orbited at an average altitude of 55km.

BBC: Nasa reveals new information about moon probes crash sites

In his first bid for mayor in 1983, he finished third in a three-person Democratic primary.

ECONOMIST: Mayor Daley��s arboretum

In its School Organisation Review, Suffolk County Council is replacing the three-tier system of primary, middle and secondary schools with the two-tier system which cuts out the 40 middle schools.

BBC: Suffolk's middle schools closure programme starts