U. S. Federal Railway Administration Research and Development Office developed a track surface and underground rock movement investigation system.
美国联邦铁路局研究开发办公室通过一项研究项目。开发出一种轨道表面及地下岩土移动勘测系统。
The CIA's Office of Research and Development created this camera that was small and light enough to be fitted to a pigeon.
中情局研发办公室发明了这种可以由鸽子携带的小巧轻便的照相机。
The CIA’s Office of Research and Development created this camera that was small and light enough to be fitted to a pigeon.
中情局研发办公室发明了这种可以由鸽子携带的小巧轻便的照相机。
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