过去十年里，空气质量逐渐下降。

There has been a ___progressive decline in air quality over the past decade.

阿尔茨海默症是一种逐渐损害记忆和认知功能的进行性疾病。

Alzheimer's is a ___progressive disease that gradually impairs memory and cognitive function.

向可再生能源的转变是一个渐进的过程，并在最近几年加速。

The shift towards renewable energy has been a ___progressive process, accelerating in recent years.