She felt nervous, increasingly lacking in confidence about herself.
她感到緊張，對自己越來越缺乏信心。
These tasks were repetitive, lengthy and lacking any intrinsic interest.
這些作業重復冗長，沒有什么意義。
What was lacking was a way of giving such images permanent form.
真正缺少的是將這些影像永久保存下來的方法。