It has taken until now to pin down its exact location.直到現(xiàn)在才確定了它的準(zhǔn)確位置。We should use our secondary forces to pin down several enemy columns.我們應(yīng)該用助攻部隊(duì)來(lái)牽制住敵人的幾個(gè)縱隊(duì).He was sure he would pin down the enemy between two firing li...