expedition/ˌekspɪ'dɪ∫ən/

n. a long organized journey, esp. to a dangerous place

n. [C] 远征；探险：A group of twenty scientists went on an expedition to the North Pole last month. 一个由20名科学家组成的队伍于上月去北极探险。

构词ex- + ped（脚）+ i + -tion→“走出去”引申为“远征”

同根 pedestrian