鲁教版八年级上Unit1Section B 2(7)

鲁教版八年级上

to suddenly go down onto the ground or towards the ground without intending to or by accident v. 落下; 跌落 without other people adv. 单独地; 孤独地 fall alone

an animal which is kept in the home as a companion and treated kindly pet n. 宠物