I took a deep breath of the fresh sea air.

我深吸了一口海边的新鲜空气。

《柯林斯英汉双解大词典》

As the sea creeps into these fresh water marshes, however, rising salinity is hampering rice production.

然而，随着海洋蔓延至这些淡水沼泽，盐度的上升正在阻碍水稻的生产。

youdao

Beneath the Sahara are huge aquifers, basically a sea of fresh water, that's perhaps a million years old filtered through rock layers.

撒哈拉沙漠下面是巨大的含水层，基本上是一片淡水的海洋，那可能是经过岩石层过滤的，已经有一百万年历史。

youdao