词典释义：
双语例句
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Beginning as clear, sparkling, mountain Brooks, some of these streams, by a long course through reed and grass-grown tracts, become miasmatic and brackish.
这些清澈、透明的山间小溪，在漫长的途中，流过芦苇和大片草地，有些已经带有毒瘴之气，而且变得微咸。