在选择步行街商场的具体位置时，实际上有两个考虑因素。
In choosing a specific location for a pedestrian mall, there are in fact two considerations.
在选择对象类时，需要提供具体对象类中包含的所有必需属性。
When you select an object class, you need to supply all the mandatory attributes included in the particular object class.
若在指定的地点没有决定具体交货点，且有几个具体交货点可供选择时，卖方可以在指定的地点选择最适合其目的的交货点。
If no specific point has been agreed within the named place, and if there are several points available, the seller may select the point at the place of delivery which best suits his purpose.
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