Once Polish air space was entered, the Polish aviationauthority would secretly shepherd the flight, leaving no public documentation.
飞机一旦进入波兰领空，波兰民航当局会秘密的引导航班，不留下任何公共记录。
We refocused our view to accelerate documentation of the broad-leaved flora, and the Dendrological Documentation Project (DDP) took flight in 1976.
因此我们重新把工作重点放到加快阔叶植物的整理归档上来，这样在1976年树木整理归档项目（DDP）就正式启程了。
We refocused our view to accelerate documentation of the broad-leaved flora, and the Dendrological Documentation Project (DDP) took flight in 1976.
因此我们重新把工作重点放到加快阔叶植物的整理归档上来，这样在1976年树木整理归档项目（DDP）就正式启程了。
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