act like a knucklehead 表现得很笨
poor knucklehead 可怜的傻瓜
such a knucklehead 真是个笨蛋
don't be a knucklehead 别犯傻
classic knucklehead behavior 典型的愚蠢行为
1. Don't be a knucklehead and forget your homework again.
别犯傻了，不要再忘记带作业。
2. My brother can be a knucklehead sometimes, but he means well.
我哥哥有时候有点笨，但他的本意是好的。
3. The knucklehead made a simple mistake during the project.
那个粗心的人在项目中犯了一个简单的错误。
4. Everyone laughed when he admitted he had acted like a knucklehead.
当他承认自己表现得很傻时，大家都笑了。
A: Why did Tom leave his bag at school again?
A：汤姆为什么又把书包忘在学校了？
B: He can be a knucklehead sometimes, but he will learn from it.
B：他有时候会犯傻，但他会从中吸取教训。
1) 指愚蠢、粗心或做事欠考虑的人
2) 非正式口语表达，常用于朋友间调侃
3) 语气通常比 idiot 更轻，有时带亲昵意味
1. 笨蛋；傻瓜；做事不聪明的人
e.g. He is a good friend, even if he is sometimes a knucklehead.
虽然他有时候有点傻，但他是个好朋友。
2. 粗心大意的人；缺乏判断力的人
e.g. Only a knucklehead would ignore such an important instruction.
只有傻瓜才会忽视这么重要的指示。