ponder

She would often ponder the choices that led her here, lost in the maze of her thoughts.她常常陷入自己思绪的迷宫中，思考着带她来到这里的选择。

Late at night, he would lie awake and ponder what could have been.深夜里，他会醒着躺在床上，思考本可能发生的事情。