dummy run

trial or practice attack, performance, etc 攻击、 表演等的试验或演习.

dug, dug-out, duke, dukedom, dulcet, dulcimer, dull, dullard, dullness, dully, duly, dumb, dumb show, dumb waiter, dumb-bell, dumbfound (also dumfound), dumbly, dumbness, dumdum, dummy, dump, dumper, dumpiness, dumping, dumpling, dumps, dumpy, dun, dunce, dunce's cap, dunderhead, dune, dung, dungarees, dungeon, dunghill, dunk, duo, duodecimal, duodenal,