他对童年时光的记忆已经模糊不清了。

His ___recollection of childhood days has become quite hazy.

她对那次旅行的回忆依然非常清晰。

Her ___recollection of that trip is still very vivid.

经过一番回忆，他想起了那个重要的约会。

After a moment of ___recollection, he remembered the important appointment.