龙套演员 电影中的小角色作用是如背景般陪衬主角而且多半没有对白在演职员字幕中也不一定能够列名
In movies, minor roles played by extras serve as a backdrop to complement the main characters, and they usually have no dialogue. They may not be listed in the credits of the cast and crew
以上为机器翻译结果，长、整句建议使用 人工翻译 。