首先，因为海水变热时膨胀，海平面可能提高。

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

Source: Tatoeba

Sentence Composition

1 首先 shǒuxiān
  1. first (of all)
  2. in the first place
2 因为 yīnwèi
  1. because
  2. owing to
  3. on account of
3 海水 hǎishuǐ seawater
4 变 biàn
  1. to change
  2. to become different
  3. to transform
  4. to vary
  5. rebellion
5 热 rè
  1. to warm up
  2. to heat up
  3. hot (of weather)
  4. heat
  5. fervent
=6 时 shí old variant of 时 shí
=6 时 Shí surname Shi
=6 时 shí
  1. o'clock
  2. time
  3. when
  4. hour
  5. season
  6. period
7 膨胀 péngzhàng
  1. to expand
  2. to inflate
  3. to swell
8 海平面 hǎipíngmiàn sea level
9 可能 kěnéng
  1. might (happen)
  2. possible
  3. probable
  4. possibility
  5. probability
  6. maybe
  7. perhaps

classifier: 個
10 提高 tígāo
  1. to raise
  2. to increase
  3. to improve