The view model here makes a concrete reference to the service.
这个视图模型对服务做了一个具体的引用。
A portlet must define a unique id that each concrete portlet can reference.
portlet必须定义每个具体portlet都可以引用的唯一标识。
It can be used for reference to professional to design and construct big cubage concrete.
对于从事大体积混凝土设计和施工的专业人员，有一定参考价值。
Highway construction of concrete is of some reference value.
对公路砼施工有一定的参考价值。
Highway construction of concrete is of some reference value.
对公路砼施工有一定的参考价值。
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