The variation of the Marine ecological environment.
海洋生态环境的变化。
It is in great requirement to control marine pollution and protect marine ecological environment.
控制海水污染，保护海洋生态环境迫在眉睫。
It is in great requirement to control marine pollution and protect marine ecological environment.
控制海水污染，保护海洋生态环境迫在眉睫。
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