level cross country

例句：

1. 1. The level of the river is very high.
   这条河的水位很高。
2. 2. He has a level of proficiency in English that is impressive.
   他在英语方面的熟练程度令人印象深刻。
3. 3. The company's performance levels have been declining over the past few years.
   这家公司过去几年的业绩一直在下降。