i would go with naturalists, marine biologists, and/or

來源: blackmatter 於 2016-07-08 17:22:30 [] [舊帖] [給我悄悄話] 閱讀數 : (340 bytes)

some special adveture groups. That's different stories. It's like to go to Amazon tribes or hiking in Himalaya, you'll need local guides. 

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