Before each math class, I see her either helping the class at the front, or bringing the homework of the class together.

每次数学课前，我都看到她要么在前面辅导同学，要么就是在把全班的作业整理在一起。

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These Personas are reflected, together with their goals and skills, into a class diagram where each Persona is associated with the System Actors (that is, the user roles) it typically covers.

这些角色，以及其目标和技能映射到类图中，其中每个角色与其覆盖的系统参与者(换句话说，用户角色)相关联。

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The StringBuilder class in the System.Text namespace joins strings together without allocating a new string instance each time; this efficiency greatly improves memory utilization.

Text 命名空间中的 StringBuilder 类无须每次分配新的字符串实例即可将字符串连接在一起；这一效率大大改进了内存的利用。

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