记住，e代表元电荷，而非电子所带电荷。

Remember, e represents the elementary charge, not the charge on the electron.

youdao

角色代表元数据，描述业务对象中的哪个属性与属于该关系的其他角色中描述的属性相关联。

The role represents metadata that describes which property in the business object is correlated to the properties described in the others roles that are part of the relationship.

youdao

事实上，一个UML2.0原型被定义成好像它仅仅只是一个现有uml元类的子集，并带有关联的属性(代表加有标签的值的标签)，操作和限制。

In effect, a UML 2.0 stereotype is defined as if it were simply a subclass of an existing UML metaclass, with associated attributes (representing tags for tagged values), operations, and constraints.

youdao

Remember, e represents the elementary charge, not the charge on the electron.

记住，e代表元电荷，而非电子所带电荷。

麻省理工公开课 - 固态化学导论课程节选