extremeness

例句：

1. 1. The weather was extremely hot during the summer.
   夏天的天气极其炎热。
2. 2.He had an extreme fear of heights.
   他极度害怕高处。
3. 3. The company is facing an extreme challenge in its business strategy.
   该公司在其商业策略上面临着极大的挑战。