In particular, the interaction between the main actor and the system involves a boundary class.

尤其是主要参与者与系统的交互，其包含了边界类。

youdao

These use cases are grouped in four major functional areas based on the main actor that initiates the use cases, as shown in Figure 5.

这些用例根据发起用例的主要参与者归入了四个主要功能区域，如图 5 中所示。

youdao

Although the language of lens has long been recognized as a main actor in a movie, the aesthetic enjoyment brought from each kind of sound factors in the movie cannot be substituted and neglected.

虽然镜头语言一直被公认为电影中的当家花旦，但影片中各种声音因素所带来的审美享受也是不可替代，不容忽视的。

youdao

As NATO's main actor, America would rather work through the alliance, or through individual countries.

ECONOMIST: Charlemagne: Europe and America | The

Europe would have to be the main actor in its own backyard.

BBC: Will Sarkozy get a statue in Tripoli?

Today, Thompson knows his actor identity is the main source of the name-and-face recognition that makes him viable in national politics.

NPR: Reagan Sequel? Hard Act for Thompson to Follow