这位导演喜欢选用非专业演员来增加电影的质朴感。

The filmmaker prefers to work with ___non-actors to bring a raw quality to his movies.

在这个系统中，监控摄像头只是一个非参与者，它只记录数据而不进行任何分析。

In this system, the surveillance camera is just a ___non-actor that records data without any analysis.