At a high school senior prom, a masked killer stalks four teenagers who were responsible for the accidental death of a classmate six years previously.陈一(yī )这里对于(yú )畜牧场的研究(jiū )也是如(❄)火如荼，一份份图纸铺开在桌子(🏿)上(🙌)，四人在图纸旁边滔滔不绝(jué )的(de )讲述着自己的观点。