下面的定义可用于创建一个多态的纪录。
The following definitions can be used to create a polymorphic record.
参照一下下面的定义，重点处我已经用粗体表示。
Consider the following definitions where, again, I've bolded some of the key characteristics.
现在，需要连接到数据库，并用下面的定义创建一个表。
Now, you'll want to connect to the database and create a table with the following definition.
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