mob extra的用法和樣例：
例句
- Working as an extra in that film was fun.
在那個電影里做臨時演員很有意思。 - As I contemplated the notion of farting joints the chiropractor's fleshy hands yanked my head left and then right, as if I was an extra in some martial arts movie.
如我所料，治療師用他那雙肉嘟嘟的手將我的頭向左向右猛的一拉，就完成了關節排氣，而我在整個過程中就像動作片中的臨時演員。
