When they got home,Jane cooked their dinner in the microwave
When they got home,Jane cooked their dinner in the microwave oven and without realizing it,cooked her fiance's wallet as well.这里为什么and without realizing it后面可以跟一个逗号跟一个句子cooked her fiance's wallet as well,而且这个句子没有主语,这是什么用法,without realizing it,是不是相当于一个插入语?