1. 远征;探险
    An expedition is an organized journey that is made for a particular purpose such as exploration.

    e.g. ...Byrd's 1928 expedition to Antarctica.
           伯德1928年前往南极洲的探险

2. 远征队;探险队
    You can refer to a group of people who are going on an expedition as an expedition .

    e.g. Forty-three members of the expedition were killed.
           探险队中43名成员遇难。

3. 远足;短途旅行
    An expedition is a short journey or trip that you make for pleasure.

    e.g. Caroline joined them on the shopping expeditions.
           卡罗琳加入了他们的购物之旅。
    e.g. ...a fishing expedition.
           垂钓之旅