默认情况下，类通常是可串行化的。

Classes are often serializable by default.

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连接器必须是可串行化的。

Connectors must be serializable.

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如果是，则需要这些对象是可串行化的，否则，就应该在串行化过程中将其删除，在解串行化过程中重新建立。

If so, those objects will need to be serializable, or they should be discarded during serialization and re-established during de-serialization.

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