quarterstaff

n strong pole, 6 to 8 feet long, formerly used as a weapon （旧时用作武器的6至8英尺长的）棍棒.

quantum theory, quarantine, quark, quarrel, quarrel with, quarrel with (sb.), quarrelsome, quarry, quart, quarter, quarter sessions, quarter-day, quarter-final, quarter-light, quarter-note, quarterdeck, quarterly, quartermaster, Quartermaster-General, quarters, quartet, quarto, quartz, quasar, quash, quasi-, quatercentenary, quatrain, quaver, quavery, quay, quayside, queasily, queasiness, queasy, queen, queen bee, queen consort, queen dowager, queen mother,