PLATO believed that men are divided into three classes: gold, silver and bronze.

柏拉图认为，人类按其天赋可分为三等：黄金； 白银； 青铜。

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The current projects of the ODF Toolkit community can be categorized into three classes.

ODF Toolkit社区当前的项目可以分为三类。

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Earthquakes are grouped according to their origin, into three classes.

地震按其起因可分为三类。

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The problem is that in Brazil the law effectively divides drugs into three classes.

FORBES: Internet Drugs

Until now, the Pentagon has divided foreigners into three classes for the sharing of defence information.

ECONOMIST: European aerospace