又考虑到在明确规定的时限内，以透明、可核查和不可逆转的方式禁止和消除核武器是防止使用或威胁使用核武器的唯一有效保障；
Also considering that the only effective guarantee against the use or threat of use of nuclear weapons is their prohibition and elimination in a transparent, verifiable and irreversible manner, within clearly established time frames;