1. 解放
    To liberate a place or the people in it means to free them from the political or military control of another country, area, or group of people.

    e.g. They planned to march on and liberate the city...
           他们计划继续挺进，解放该城市。
    e.g. They made a triumphal march into their liberated city.
           他们胜利地开进了被他们解放的城市。

2. 使解脱；使脱离；解救
    To liberate someone from something means to help them escape from it or overcome it, and lead a better way of life.

    e.g. He asked how committed the leadership was to liberating its people from poverty.
           他问领导层有多大决心要让人民脱贫。

3. 释放（囚犯）
    To liberate a prisoner means to set them free.

    e.g. The government is devising a plan to liberate prisoners held in detention camps.
           政府计划释放关押在拘留营内的囚犯。