fish have a refuge in the streams and can expand into the lagoons when the lake is low and the lagoons are separate, Harper said All the lagoons join when the lake is high and fish must retreat to their stream refuges or die.
2017年12月六级真题（第三套）阅读 Section C
Some fish, too, have had limited success vacationing at the lake as less salty lagoons form on the outer edges from hot springs flowing into Lake Natron.
2017年12月六级真题（第三套）阅读 Section C
柯林斯高阶英汉双解学习词典释义
N-COUNT
瀉湖；环礁湖
A lagoon is an area of calm sea water that is separated from the ocean by a line of rock or sand.