For a single class, you can define the name of the class, its attributes, and its operations.

对于一个单独的类，你可以定义类的名字，属性和操作。

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Figure 8 presents the solution for the third mapping strategy — mapping a single class to a single data entity.

图8显示了第三种映射策略的解决方案——将单个类映射成单个数据实体。

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Modern vector control for malaria is exceptionally dependent on a single class of molecule, the pyrethroids.

现代的疟疾病媒控制特别依赖于单一化学分子，即除虫菊酯。

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He says the class action failed because it did not target a single action or policy by Wal-Mart.

VOA: special.2011.06.24

Netscape and Opsware, which he helped found, went public with single-class share structures in 1995 and 2001, respectively.

WSJ: In Silicon Valley, Founders Fight for Control

But with B-share holders calling the shots, such firms tend to underinvest, leading to lower sales growth and valuations than with single-share-class firms, according to a study by Harvard Business School's Paul Gompers, Stanford's Joy Ishii and Wharton's Andrew Metrick.

FORBES: Magazine Article

Three of the four worst returns occurred in single-asset class portfolios.

FORBES: The Multiple Rewards of Multi-Asset-Class Investing