It consists of a property, on which correlation is based, and aliases for that property.
它由相关性所基于的属性和该属性的别名组成。
You may even list the properties explicity, but you must let Hibernate provide SQL column aliases for each property.
你可以显式的列出需要的属性，但是你必须让Hibernate为每个 属性提供SQL列别名。
The placeholders for these column aliases are the property name qualified by the table alias.
这些列的的占位表示符是以表别名为前导，再加上属性名。
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