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。