Definition: not having something, or not having enough of something Level: B1
她唯一的问题是缺乏信心。
Her only problem is ___lack ___of confidence.
睡眠不足让他变得易怒。
___Lack ___of sleep had made him irritable.
如果他失败，那不会是因为缺乏努力。
If he fails, it won't be for ___lack ___of effort.
