1. 纪念碑
    A memorial is a structure built in order to remind people of a famous person or event.

    e.g. Building a memorial to Columbus has been his lifelong dream...
           为哥伦布建一座纪念碑是他一生的梦想。
    e.g. Every village had its war memorial.
           每座村庄都有自己的战争纪念碑。

2. （对逝者）纪念的;悼念的;追思的
    A memorial event, object, or prize is in honour of someone who has died, so that they will be remembered.

    e.g. A memorial service is being held for her at St Paul's Church.
           她的追悼会正在圣保罗教堂举行。
    e.g. ...memorial plaques to local regiments...
           发给驻扎本地的兵团的纪念章

3. （追忆逝者的）纪念物,纪念品
    If you say that something will be a memorial to someone who has died, you mean that it will continue to exist and remind people of them.

    e.g. The museum will serve as a memorial to the millions who passed through Ellis Island...
           这个博物馆将用来纪念经过埃利斯岛的数百万移民。
    e.g. The city's rather uncompromising bleakness is a permanent memorial to its dark and mysterious founders.
           这座城市毫不妥协的荒凉面貌是对其神秘莫测的创建者的永久纪念。