1. The time I spent at exercise gradually diminished.
    我花在锻炼上的时间逐渐减少，

2. His strength has diminished over the years.
    经过这许多年月, 他的体力不如从前了.

3. However, my enthusiasm waned. The time I spent at exercises gradually diminished.
    但我的热情退了。我花在体操上的时间渐渐地减少。

4. However, my enthusiasm waned. The time I spent at exercises gradually diminished.
    但我的热情退了。我花在体操上的时间渐渐地减少。