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不动声色
Set one's face like a flint.
Keep a straight face.
keep one's countenance.
Bit one's lips.
Keep quiet.
As quiet as a mouse.
eg：He sat there, setting his face like a flint and tried to find out who was the suspect.
同义词：面不改色 Without turning a hair.
反义词：虚张声势 Barking dogs seldom bite.
