1.And a British-led scientific mission off the Seychelles has successfully retrieved an underwater drone from the Indian Ocean.
 retrieve回收
The men were trying to retrieve weapons left when the army abandoned the island.
那些人正试图找回该军队撤离这个岛时留下的武器。

2.The Nekton Mission is on an uNPRecedented exploration to document changes that could affect billions of people.

uNPRecedented前所未有的

Such a move is rare, but not uNPRecedented.
这样的举动少见，但并非从来没有过。
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