late 15c., from ah, lack, from lack in Middle English sense of "loss, failure, reproach, shame." Originally an expression of dissatisfaction, later of regret or unpleasant surprise.
权威例句
1. Alas and alack , we had missed our bus.
唉,完了,我们没赶上公共汽车。
2. Long ago I had a heart, and sighed alas ! alack!