Often, the service data is a selection and projection (or view) of domain data.
通常，服务数据是域数据的一个选集和投影(或者视图)。
Often, the service data is a selection and projection (or view) of domain data.
通常来说，服务数据是域数据的选择和投影（或者视图）。
Top view of square head set screw. Selection box represents thread diameter.
方头螺钉的俯视图。选择框代表螺纹直径。
Top view of square head set screw. Selection box represents thread diameter.
方头螺钉的俯视图。选择框代表螺纹直径。
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