poker-faced
adjective uk/ˈpəʊ.kəˌfeɪst/ us/ˈpoʊ.kɚˌfeɪst/
面无表情的;一本正经的
not showing what you are thinking or feeling in your face
She sat poker-faced all the way through the film. 整场电影，她一直泥塑木雕般坐着。
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