To supply hydrodynamic parameters for ship launching, computational fluid dynamics(CFD) method was used to analyze the process of longitudinal gravity launching for ship from a slipway.
为给船体下水提供水动力参数，采用计算流体动力学（CFD）方法对船体从船台上纵向重力式下水过程进行动力学分析。
The point is that breaking free of Earth's gravity will no longer require so much energy — perhaps 100 times less than launching the space shuttle.
最主要的是，摆脱地球引力将不再需要那么多的能量——也许还不到发射航天飞机所需能量的1％。
The point is that breaking free of Earth's gravity will no longer require so much energy — perhaps 100 times less than launching the space shuttle.
最主要的是，摆脱地球引力将不再需要那么多的能量——也许还不到发射航天飞机所需能量的1％。
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