平面

首先，因為海水變熱時膨脹，海平面可能提高。

shǒuxiān yīnwèi hǎishuǐ biàn rè shí péngzhàng hǎipíngmiàn kěnéng tígāo

First of all, the level of the ocean could rise, because ocean water expands as it grows warmer.