The liquids employed for rocket propulsion are called propergols.

多级火箭是装有一台以上发动机的火箭。

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It is laid in the sea bottom and will rise to surface with its rocket propulsion.

它被储存在海底和将使用它的火箭发动机快速上浮到水面。

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Gel propellant is a new kind of propellant for rocket propulsion and other gas generator.

胶体推进剂是火箭推进和其它燃气发生器的新型待选推进剂。

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Across the table was a scientist working on rocket propulsion at (I believe) Marshall Space Center.

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The latter include, for example: supercomputers, advanced machine tools, fiber optic and other sophisticated telecommunications gear, jet engine hot sections, rocket propulsion and guidance components, "stealth" technology, to name a few.

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Building that larger missile would require major advances in metallurgy, rocket engines, guidance and propulsion, and probably foreign assistance.

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