Baltic Sea

baltic-sea的词性：
NONE（无词性）

1. An arm of the Atlantic Ocean in northern Europe bounded by Denmark, Sweden, Finland, the U.S.S.R., Poland, and Germany. It opens to the North Sea via channels and canals, is mostly shallow, with relatively low salinity, and often freezes for three to five months of the year.
波罗的海：大西洋的一个海湾，位于欧洲北部，以丹麦、瑞典、芬兰、前苏联、波兰和德国为界。通过海峡和运河向北海开通，大部分水浅，含盐度底，每年常常有三至五个月结冰