MPLS VPN网络中用户拥有的VPN权限是由用户所处的物理位置决定的，很不灵活。
The VPN rights of users in MPLS VPN network is based on their location. It is not flexible.
YZ市邮政快递出现这种现象的原因很多，包括体制的束缚、机制不灵活、网络硬件建设滞后等。
Many factors led to this disappointing situation for YZ express service, for instance, constrained policy, rigid system, outdated network infrastructure.
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