煤焦油曾为近代有机化工作出了历史性贡献。
Coal tar has been a historic contribution to modern organic chemical industry.
这些单位往往是用人的名字来命名，以纪念对该领域有历史性贡献的专家们。
Often those units are named after people to recognize historic contributions to their field of expertise.
所以在这个特殊的历史性时刻，我们向你致敬，感谢你为世界和平所做的贡献。
And so at this special time of year and at this historic time, We salute you and thank you for what you have done for world peace.
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