1. 悼念;哀悼;向…致哀
    If you mourn someone who has died or mourn for them, you are very sad that they have died and show your sorrow in the way that you behave.

mourn的翻译

    e.g. Joan still mourns her father...
           琼仍在为父亲的死伤心。
    e.g. The whole nation had mourned the death of their great leader...
           举国向去世的伟大领袖表示了深深的哀悼。

2. 为失去…而悲哀;为…感到遗憾
    If you mourn something or mourn for it, you regret that you no longer have it and show your regret in the way that you behave.

    e.g. We mourned the loss of our cities...
           我们为失去多座城市而痛心。
    e.g. She mourned for the beloved past.
           她怀念美好的过去。

3. see also: mourning