His face had become peculiarly expressionless.

他的脸变得异乎寻常地毫无表情。

《柯林斯英汉双解大词典》

His face was expressionless, but Alex felt the unspoken criticism.

他面无表情，但亚历克斯感觉到了他无言的批评。

《柯林斯英汉双解大词典》

The man watched him go, and though his face was expressionless as ever, his eyes were like the eyes of a wounded deer.

后面那个人瞅着他这样走去；脸上虽然照旧没有表情，眼睛里却流露着跟一头受伤的鹿一样的神色。

youdao

As he spoke of Baxter, of how he found out about the suicide, Skilling kept his face expressionless.

NPR: Skilling Takes Stand, Proclaims Innocence at Enron Trial