If there is discrepancy between the access level value specified by the user and what the remote procedure actually does at the data source, data inconsistency might occur.
如果在用户指定的访问级别值与远程过程在数据源上实际采用的级别之间有差异，那么可能出现数据不一致。
The return value from the remote procedure is converted into a standard Perl scalar by call and printed.
远程过程的返回值通过call转换成标准的Perl标量，并打印出来。
Remote method calls still use call-by-value semantics of which you certainly need to be aware.
远程方法调用仍然使用按值调用(call - by - value)语义，您当然需要知道该语义。
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