Because Hibernate doesn't know what specific class you're after, it has to read every column (including the discriminator column), then determine which class to instantiate and, finally, populate it.
因为Hibernate不知道您要查询哪个特定的类，所以必须读取每个列(包括discriminator类)，然后才能决定要初始化哪个类，最后再填充它。
Finally the teacher calmly told me this title is the first question before exam, then asked me after class to explain to him why I answer on the paper is accurate.
最后老师平静的告诉我这个题目就是前天考试的第一题，接着要求我在下课后向他解释为什么我试卷上的答案准确无误。
At the class meeting, there was a long, embarrassing silence after the teacher's opening remarks. Finally Jack broke the ice by raising a question.
班会上，在老师的开场白之后，出现了长时间的，令人窘迫的冷场，最后，杰克提个问题，打破了僵局。
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