The Red Sea, the Black Sea, the Indian Ocean, or the Dead Sea?

红海，黑海，印度洋，死海？

The denser saltwater flows beneath the freshwater, where it remains permanently, making the Black Sea the world's largest meromictic — or un-mixing — basin.

密度较高的咸水在淡水底下流动，且会永远待在下面，让黑海成为世界上最大的局部循环——不完全对流——海湾。

At the London shipping office we learnt that one ship sailed for Varna in the Black Sea the night before.

在伦敦航运办公室， 我们了解到前一天晚上， 一艘船在黑海驶往瓦尔纳。

When the Huns began to appear in the steppes  of the northern shores of the Black Sea, the Vandals became highly valuable because of  their riding abilities.

当匈奴人开始出现在黑海北岸的草原上时，汪达尔人因其骑马能力而变得非常有价值。