Aeroliths are further subdivided into two classes: chondrites and achondrites.

陨石进一步细分为两类：球粒状陨石和无球粒陨石。

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For these reasons educated men then fell mainly into two classes.

因为这些缘故，受过教育的人就主要分成两类。

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Noise suppression is classified into two classes: Passive Noise Control and Active Noise Control.

噪声抑制方法可以分为两大类：被动噪声抑制和主动噪声抑制。

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That would help to explain a puzzling anomaly about comets: they fall into two classes.

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If historical correlations are low enough, we separate two indexes into different asset classes.

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During his sophomore year, he failed two classes and got into a drunken brawl with some Georgetown University football players.

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