feel low-down
feel 后接 low-down，描述自己感到沮丧、消沉。
I've been feeling low-down since I heard the news.
自从听到这个消息，我一直感到情绪低落。
沮丧,情绪低落；非常低的；卑微的；下等的
Down, depressed; feeling low in spirits.
沮丧,情绪低落
Down, depressed.
That was a low-down trick to play on your friend.
对你朋友耍那种卑鄙的把戏。
用法提示：形容词，表示行为卑劣、不光彩。
He's a low-down liar who would say anything to get what he wants.
他是个卑鄙的骗子，为了达到目的什么话都说得出来。
用法提示：形容词，修饰人，形容道德低下。
The service at that restaurant was low-down and rude.
那家餐厅的服务低劣又粗鲁。
用法提示：形容词，形容服务质量很差。
feel 后接 low-down，描述自己感到沮丧、消沉。
I've been feeling low-down since I heard the news.
自从听到这个消息，我一直感到情绪低落。
low-down 作表语形容词，说明处于情绪低落的状态。
He was low-down for several days after the exam.
考试之后，他消沉了好几天。
seem 后接 low-down，表示看起来情绪不佳。
She seemed low-down after talking to her friend.
和朋友谈过之后，她似乎情绪低落。
grammar · medium
易错句子She felt low-downly after the exam.
正确表达She felt low-down after the exam.
low-down 是形容词，feel 后面作表语要用形容词，不能加 -ly 变成副词；英语中没有 low-downly 这个词。
grammar · medium
易错句子She felt low-downer after the news.
正确表达She felt more low-down after the news.
low-down 是复合形容词，比较级要用 more low-down，不能像单音节形容词那样加 -er；low-downer 不是标准形式。
grammar · medium
易错句子He has been in a low-down since he lost his job.
正确表达He has been low-down since he lost his job.
low-down 在这里是形容词，不能加冠词 a 并放在介词 in 后作名词表示“低落状态”；表示“处于低落状态”要用 be/feel + low-down。
作表语时两者都可表示“情绪低落”，但 down 另有“向下、下降”的方向义；low-down 在本义项下只表示心情，不能用来表示方向。
low 可表示心情消沉，也常指高度、水平或声音低；low-down 只表示情绪低落，不能替换这些具体“低”的意思。
downcast 常描写低头、目光向下的沮丧神态，偏向书面描写；low-down 只说明心情，不描写低头的外在动作。
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