Communication networks can be classified in terms of their physical arrangement or topologies. Three common topologies are the star, bus, and ring.

通信网络可以按照其物理排列或拓扑结构来分类。有三种常见的拓扑结构：星型、总线型和环型。

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At least three other parakeet species have established feral breeding colonies: the most numerous is the ring-necked parakeet, now common in many London parks and suburbs.

数量最大的是现在常见于伦敦很多公园和郊区的环颈鹦鹉。

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At least three other parakeet species have established feral breeding colonies: the most numerous is the ring-necked parakeet, now common in many London parks and suburbs.

数量最大的是现在常见于伦敦很多公园和郊区的环颈鹦鹉。

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