淡水: potable water (water with low salt content), fresh water...
关闭: to close, to shut...
高科技: high tech, high technology...
下游: lower reaches (of a river), lower level, lower echelon, downstream...
丝: a thread (of cloud, smoke etc), a bit, an iota, a hint (of sth) etc...
复印: to photocopy, to duplicate a document...
