The central nervous system can be divided into three classes of neuromeres.
中枢神经系统可分为三类间体。
Earthquakes are grouped according to their origin, into three classes.
地震按其起因可分为三类。
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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