Expecially important is that air is very fresh in island in Hainan. 语法可能有些错误，但应该是对的
尤其重要的是海南岛的空气很新鲜
What's especially important is that air in Hai'nan Island is very fresh.
The air, in particular ,is quite fresh in Hainan
The most important feature in Hainan is the fresh air.
Of particular importance is the air is fresh Hainan
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