microscopic organisms settle to the seafloor and accumulate in marine mud.microscopic organisms settle to the seafloor and accumulate in marine mud.
极其微小的有机物质定居在海底层和积累在海泥中。
a settlement (= place where people settle to live) in an area where few people livea settlement (= place where people settle to live) in an area where few people live
分站 The outstations were linked to the main towns by a public transport network. 这些分站通过公共交通网络与主要城镇相连。