名词
中文翻译：缺乏自信
同义词：
['lack confidence', 'lack self-assurance']
例句：
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1. She was so nervous that she couldn't speak in front of the class.
她非常紧张，以至于在班上说不出话来。
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2. He felt very insecure about his ability to perform well in the exam.
他对自己的考试表现感到不自信。
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3. The new manager has a lot of confidence in her team's ability to achieve their goals.
新任经理对她的团队实现目标的能力充满信心。