downcast air

例句：

1. 1. She looked downcast as she walked into the room.
   她走进房间时显得心情低落。
2. 2. The news of his failure left him downcast for days.
   他失败的消息让他几天都心情低落。
3. 3. The poor child was downcast at the thought of leaving her home.
   这个可怜的孩子一想到离开家就心情低落。