名词
中文翻译：笨蛋
同义词：
['fool', 'idiot', 'foolhardy']
例句：
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1.He was a knucklehead who always made mistakes.
他真是个笨蛋，总是犯错。
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2. The teacher scolded the knucklehead for being late again.
老师又训斥那个又迟到的笨蛋。
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3.She was surprised when she found out that her knucklehead of a son had quit his job.
当她发现她那个愚蠢的儿子已经辞职时，她感到惊讶。