258，尊敬的博科娃总干事

Your Excellency Madame Irina Bokova, Director-General of UNESCO,

259，对...表示衷心的祝贺！offer sb my heartfelt congratulations on

260，对...表示诚挚的敬意！pay my sincere tribute to

261，为推动人类文明交流互鉴作出的卓越贡献
the extraordinary contribution UNESCO has made for greater exchanges and mutual learning among human civilizations.

262，和平之屏障 the defenses of peace

“战争起源于人之思想，故务需于人之思想中筑起保卫和平之屏障。”

Since wars begin in the minds of men, it is in the minds of men that the defenses of peace must be constructed.