名词
中文翻译：缺乏信心
同义词：
['lack ofconfidence', 'lack of faith']
例句：
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1. She was too nervous to speakin front of the audience.
她太紧张了，不敢在观众面前讲话。
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2. Theteam lost their confidence after the defeat.
球队在失败后失去了信心。
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3. Hefelt confident about his abilityto solve the problem.
他对解决这个问题的能力感到自信。