因此，没有偏好依附无标度网络是不能形成的。
The scale-free networks cannot be formed without preferential attachment in the local events.
当仅在加点或加边过程中考虑偏好依附时，网络是无标度网络。
When preferential attachment is only present in the processes of the addition of new nodes or new links, the networks are scale-free.
尽管生长和偏好依附是形成无标度网络的必需要素，但是这两个因素并不能保证网络一定是无标度网络。
Though growth and preferential attachment are necessary in forming the scale-free networks, the two factors cannot ensure that the network is scale-free.
尽管生长和偏好依附是形成无标度网络的必需要素，但是这两个因素并不能保证网络一定是无标度网络。
Though growth and preferential attachment are necessary in forming the scale-free networks, the two factors cannot ensure that the network is scale-free.
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