动词短语
中文翻译：保持严肃的表情
同义词：
["hold one's head high", 'maintain an air of dignity', 'maintain composure']
例句：
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1. He kept a straight face throughout the meeting, even when he knew the answer to the question.
他在会议期间一直保持着严肃的表情，即使他知道这个问题的答案。
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2.She maintained an air of dignity in front of her colleagues despite the difficult situation.
尽管处境艰难，她还是在同事面前保持着尊严。
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3. During the presentation, he held his head high and kept a straight face, showing confidence in his abilities.
在演讲中，他昂首挺胸，面不改色，显示出对自己能力的自信。