因为类型化表包含其他对象引用的对象，所以每个类型化表都必须像它的第一列那样拥有一个对象标识符。
Because typed tables contain objects that can be referenced by other objects, every typed table must have an object identifier column as its first column.
因为类型化表包含其他对象引用的对象，所以每个类型化表都必须像它的第一列那样拥有一个对象标识符。
Because typed tables contain objects that can be referenced by other objects, every typed table must have an object identifier column as its first column.
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