日落时，天空逐渐变暗。

The sky is ___dimming as the sun sets.

随着夜幕降临，路灯开始逐渐变暗。

The street lights started ___dimming as night fell.

随着时间的流逝，她对童年往事的记忆逐渐模糊。

As time went by, her childhood memories were ___dimming.