的海洋世界。科学将揭示更多的深海秘密。
参考词汇：未被开发的地区 unexplored area; 详细研究 search in detail; 商业开采 business exploration; 上层和中层水域 the upper and middle waters
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perhaps the most unexplored area on this planet is under the deep sea, which we have never been to, because they are too deep for us to search in detail. although we do have business exploration of the sea bed, the deep sea is still unknown. the environment of deep sea can still keep many secrets, though the marine life of the upper and middle waters are fairly well recorded.
to explore these areas without special m资源难易程度:★★★★★★★★★★★★★★★
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