我们不想重复去年的灾难。

We don't want a ___repetition of last year's disaster.

事实上，这可能导致过去错误的重演，当时瘫痪的联合国，由于中立国家数量少、影响力小，仅仅是两个核超级大国之间危险的军备竞赛的旁观者。

This could in fact lead to a ___repetition of the mistakes of the past, when the paralyzed United Nations were, due to the small number and influence of neutral countries, a mere bystander to the risky arms-race fought out between the two nuclear superpowers.

实验中同样错误的重发使结果无效。

The ___repetition of the same errors in the experiment invalidated the results.