随着冬季临近，日光的时间在逐渐减少。

The ___waning daylight hours signal the approach of winter.

随着时间的推移，他对这个项目的热情逐渐减弱。

His enthusiasm for the project is ___waning over time.

随着月亮的逐渐亏缺，夜晚变得越来越暗。

As the moon is ___waning, the nights grow darker.