The effect of bubbly layer on propulsion performance of planing craft is investigated by means of self-propelled model experiment in the towing tank of China Ship Scientific Research Center.

在中国船舶科学研究中心拖曳水池中，通过滑行艇模型自航试验，研究了艇底气层对滑行艇推进性能的影响，结果表明：气层对采用水螺旋桨推进的滑行艇推进性能的影响不大。

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For example, the sensors and Electronics Branch of the NASA Glenn research Center (GRC) is developing thin film sensors for surface measurement in propulsion system research (Figure 2).

例如，美国宇航局格伦研究中心(GRC)的传感器和电子处正在开发的薄膜传感器表面测量的推进系统的研究(图2)。

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Rolls-Royce says the Crosspointe campus also will house two research partnerships, the Commonwealth Center of Advanced Manufacturing and the Commonwealth Center for Aerospace Propulsion Systems.

劳斯莱斯声明这个工厂还会包含两个研究所，先进制造联合中心以及航空推进系统联合中心。

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One of two Shell ships that drilled last year in the Arctic Ocean, it has a 160-foot derrick rising from its center and no propulsion system of its own.

NPR: Grounded Shell Oil-Drilling Ship Refloated

The proposals are due April 1 of this year, and the Langley Research Center in partnership with the Jet Propulsion Laboratory and with Lockheed Martin, with the Draper Lab and Aurora Flight Sciences, is proposing a robotic airplane to fly over the surface of Mars, about a mile above the surface.

NPR: Revisiting the Viking Missions to Mars