该城市的污染水平今年已显著下降。

The pollution ___level in the city has dropped significantly this year.

要进入国家队，你需要达到非凡的技能水平。

To play in the national team, you need to reach an exceptional ___level of skill.

保持血糖水平的稳定对健康至关重要。

Maintaining a stable ___level of sugar in your blood is crucial for health.