The purchaser is the primary actor.

购买者是主要的参与者。

youdao

What you hold about the situation of "self" and "the other" is the primary actor and prerequisite of investigation from the point of view of investigation.

“己”与“彼”是互为对立的双方，从侦查角度来讲，对“己”与“彼”双方情况把握程度是决定侦查工作成败的首要因素和前提条件。

youdao

For both long and short running process use cases, there is no Primary Actor; they are always triggered by other use cases and don't directly involve any user interaction.

对于长时间运行和短时间运行的流程用例，并没有主要参与者；它们始终由其他用例触发，并不直接涉及任何用户交互。

youdao