1. 呻吟;呜咽
    If you moan, you make a low sound, usually because you are unhappy or in pain.

    e.g. Tony moaned in his sleep and then turned over on his side...
           托尼在睡梦中发出呻吟声，然后翻了个身。
    e.g. 'My head, my head,' he moaned. 'I can't see.'
           “我的头，我的头，”他呻吟着说，“我看不见了。”

2. 抱怨;发牢骚
    To moan means to complain or speak in a way which shows that you are very unhappy.

moan在线翻译

    e.g. I used to moan if I didn't get at least six hours' sleep at night.
           过去如果晚上的睡眠时间不足6小时的话，我就会抱怨。
    e.g. ...moaning about the weather...
           抱怨天气

3. 抱怨
    A moan is a complaint.

    e.g. They have been listening to people's gripes, moans and praise.
           他们一直在倾听人们的牢骚、抱怨和表扬。

4. 抱怨；发牢骚
    If you have a moan, you complain about something.

moan是什么意思

    e.g. You can go see him and have a good old moan.
           你可以去看看他，好好地诉诉苦。

5. 低沉的声音
    A moan is a low noise.

    e.g. ...the occasional moan of the wind round the corners of the house.
           风刮过屋角时间或发出的呼啸声
    e.g. ...the moan of distant traffic.
           远处车流传来的低沉的嘈杂声