Today, the two most common topologies are called ring and bus networks.

目前，有两种最普通的拓扑结构，分别称为环形网和总。

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Three common topologies are the star, bus, and ring.

有三种常见的拓扑结构：星型、总线型和环型。

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The key ring is a common key ring.

钥匙环为普通钥匙环。

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The key ring is a common key ring.

钥匙环为普通钥匙环。

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