at是介词.at,about,above,across,after,against,along,among,around,before,behind,below,between,by,down,except,for,from,in,near,of,off,on,over,since,with,inside,outside,onto,into,nearby,throughout,within,without.纯手打,望采纳.
ps,我是高中生,这里有一些高中的