无表情的脸用英语怎么说？

无表情的脸

例句

• He glanced furtively at the stolid faces of the two detectives. 他偷偷地瞄了一下两名侦探面无表情的脸孔。
• I have never looked on a face that was so devoid of feeling... 我从来没有见过一张如此面无表情的脸。
• That expressionless face had seemed deep and mysterious. 那张毫无表情的脸看上去深沉而又神秘。