Mitchell said he is not discouraged about his mission's recent setbacks, including acrimonious exchanges over a recent U.N.report alleging possible war crimes in last year's Gaza conflict, citing the example of his successful Northern Ireland peace efforts in the 1990s.

VOA: standard.2009.11.25

This is maybe not widely appreciated, but every decade that goes by we do a better job of incentvizing people and preventing them from being discouraged by risks.

也许在当下，一些措施看似并非有效，但若以十年跨度回望,我们所采取的措施确实能有效地激励人们,并且防止他们因风险受挫。

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