1. Scientists are exploring the unknown world of the deep sea.
科学家正在探索深海的未知世界。
2. Deep-sea organisms have adapted to extreme environments.
深海生物适应了极端的环境。
3. There are many species that have not yet been discovered in the deep sea.
深海中存在许多尚未被发现的物种。
4. The temperature in the deep sea is very low.
深海的温度非常低。
5. The pressure in the deep sea is much greater than on the surface.
深海的压力比地表大得多。