不露声色用英语怎么说？

不露声色

例句

• I noticed, behind the neutrality of his gaze, a deep weariness. 我注意到他不露声色的注视背后藏着深深的厌倦。
• 'Martin is one of us,'said O'Brien impassively. “ 马丁是咱们的人, ” 奥勃良不露声色地说.
• "That is surprising." — "Hardly," I said drily. “那真令人吃惊。”——“这有什么，”我不露声色地说。
• Mr Brooke is renowned for his dry wit. 布鲁克先生因他不露声色的机智而闻名。