一个参与者可以是一个人或者代表一个或者多个人的角色。
An actor can be a person or a role that represents one or multiple people.
您应该为每个人类参与者提供一组相关的角色（参见图2）。
You should have a set of associated personas for every human actor (see Figure 2).
真正重要的是参与者扮演的角色。
所有参与者除了自身担任的特定角色外，也都是检查者。
All participants are inspectors, in addition to any specialized role they might have.
隐匿的乙肝病毒感染：是少许参与者还是角色扮演者？
Occult hepatitis B virus infection: Bit player or role player?
让每一个参与者都都扮演着重要的互相联系而非不可或缺的角色。
So that each actor plays an important dependent but not indispensable role.
让每一个参与者都都扮演着重要的互相联系而非不可或缺的角色。
So that each actor plays an important dependent but not indispensable role.
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