threesome/ˈθriː.səm/名词三人一组After a long day of hiking in the mountains, the three best friends decided to have a memorable threesome by sleeping under the stars together.在山里长时间徒步旅行之后,这三位最好的朋友决定共同留下难忘的回忆,一起睡在星空下。想跟读,去练习