当别人说话时插嘴是很粗鲁的。
It's rude to ___butt ___in when someone else is speaking.
他在冰上滑倒，直接摔了个屁股墩儿。
He slipped on the ice and landed directly on his ___butt.
宝宝正在学走路,总是摔到屁股上。
The baby is learning to walk and keeps falling on her ___butt.
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