为什么海洋探索如此重要 英语作文 120字（为什么海洋探索很重要英语议论文）

As we all know the sea food we eat is from the oceans.In the past,the oceans was very clean and beautifull,there were a lot of sea animals in them.But nowadays the oceans is dirty,many sea animals are die.we must keep them clean.We must stop polluting them.The oceans is very important to us!