n a flat wing-shaped process or winglike part of an organism
n a wing of an insect
r by bad luck
interj. 唉
1. Alas, I cannot attend the party this weekend.
唉，我这个周末无法参加聚会。
2. She tried her best, but alas, she failed the exam.
她尽了最大努力，但唉，她没通过考试。
3. The movie was highly anticipated, but alas, it turned out to be disappointing.
这部电影备受期待，但唉，结果令人失望。