They made their finding by looking at records of the transparency of sea water, which is affected by the plants.

他们通过分析海水透明度(受浮游植物影响)记录发现了这一问题。

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The transparency of sea water here is the highest, and on the coast of the island there are many in-depth mouth of the Gulf.

这里海水的透明度是最高的，而且，海岸上有许多深入岛内的河口、海湾。

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