连接关闭后不允许再执行操作。
receive语句将暂停进程中的执行，确保进程等待至新消息传入，之后再执行操作。
The receive statement pauses execution in the process, ensuring that the process is now waiting until a new message comes in before performing an operation.
如果核心对一个数据块执行了一项操作的话，那它必须再另建一个数据块来保存结果。
If a core performs an operation on data stored in a chunk, it must create a new chunk to store the results.
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