19. Also decides that once a Member State selects the option of one-time payment, that selection shall be irrevocable, unless otherwise notified to the Secretary-General by the end of the period of one hundred and twenty days referred to in paragraph 16 above;
19. 又决定，会员国一旦作出一次性付款的选择，便不可变更，除非在上文第16段所述的120天期间结束前通知秘书长；