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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Society has polarized into two classes.

社会已分化成两个阶级。

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A group of children were randomly divided into two classes.

一群孩子被随机分成两个班。

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

ECONOMIST: Unbuckling the Kuiper belt

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

FORBES: Asset Allocation and the Efficient Frontier

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

FORBES: Under Armour CEO Kevin Plank And His Underdog Horse Farm