dirt

n.尘，土，污物；下流话，脏话

direct debit, direct object, direct speech, direct tax, directed, direction, direction-finder, directional, directive, directly, directness, director, director-general, directorate, directorship, directory, dirge, dirigible, dirk, dirndl, dirt cheap, dirt farmer, dirt road, dirt-track, dirtily, dirty, dis-, disability, disable, disabled, disablement, disabuse, disadvantage, disadvantaged, disadvantageous, disadvantageously, disaffect, disaffected, disaffection, disafforest,