在整个纪律听证会上，他脸上一直挂着一副愚蠢的傻笑。
He kept a fatuous grin on his face throughout the entire disciplinary hearing.
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解释
愚蠢的、不合时宜的（表情）
He kept a fatuous grin on his face throughout the entire disciplinary hearing.
愚蠢的、不合时宜的（表情）