7. pre- un- prehistoric, pre-war, prearrange nr oung preconscious unadvisable, uncommon, unimportant N · uncover, unfasten, unload, unfold(打开,解开, 拿开) unseen, unexpected, unemployed(不,没有) unhappiness, uncertainty, unemployment(不,没 有) self-discipline, self-support, self-educated, self- contradictory, self-supporting7.pre-; un-; self- • prehistoric, pre-war, prearrange, preannounce, preconscious • unadvisable, uncommon, unimportant (不) • uncover, unfasten, unload, unfold （打开，解开， 拿开） • unseen, unexpected, unemployed (不，没有) • unhappiness, uncertainty, unemployment ((不，没 有) • self-discipline, self-support, self-educated, self￾contradictory, self-supporting