她在关键的发球上出现了失误，输掉了比赛。
She made a ___blunder on the crucial serve and lost the match.
他在报告里犯了个大错，把两个客户的数据搞混了。
He ___blundered in the report by mixing up two clients' data.
他在厨房里笨手笨脚地打翻了牛奶。
He was ___blundering around the kitchen and spilled the milk.
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