spawn创建的新进程将在终止之前继续执行，可能正常终止(即无错误)，也可能非正常终止(即发生了某些错误)。
The new process created by spawn will continue to execute until it terminates, either normally (that is, with no error) or abnormally (some fault occurred).
spawn创建的新进程将在终止之前继续执行，可能正常终止(即无错误)，也可能非正常终止(即发生了某些错误)。
The new process created by spawn will continue to execute until it terminates, either normally (that is, with no error) or abnormally (some fault occurred).
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