a faceless mob的用法和样例：
- He quirked up his nose to make a face.
- "To pull a face" is an idiomatic expression.
"To pull a face""愁眉苦脸"是一个习惯表达法。
- She has a face like a saint- a saint bernard.
- He pulled a face at the taste of the soup.
- He came back with a face as long as a fiddle.
- He made a face at the taste of the soup.