Definition: an organized journey, especially a long one for a particular purpose Level: B1
他们正在计划一次前往北极的远征，以研究气候变化。
They are planning an ___expedition to the North Pole to study climate change.
我们学校的登山之旅既充满挑战又很有趣。
Our school ___expedition to the mountains was both challenging and fun.
这次科学考察队在热带雨林里发现了新的物种。
The scientific ___expedition discovered new species in the rainforest.
