散步时，他常常沉浸在对自己过去的反思中。

During his walks, he often loses himself in ___reflection about his past.

她看着湖水中自己的倒影，陷入了沉思。

She stared at her ___reflection in the lake water, lost in thought.

湖面上月光的倒影看起来很美。

The ___reflection of moonlight on the lake looks beautiful.