It is shown that aerospike nozzle performance losses caused by free stream primarily result from increase of lift body base drag and decrease of plug pressure distribution.

结果表明，外流造成的性能损失主要体现在运载器底部阻力增加和塞锥表面压强降低两方面。

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Then, the base bleed method is introduced on a general supersonic missile to decrease the base drag of the inlet cowl for the first time and is validated by wind tunnel test.

本文首次将底部排气法应用于导弹上，结合一种具有常规气动布局的超声速导弹进行了底部排气方案设计，采用一种“底窝器”来提高进气道整流罩的底部压强，并进行了风洞实验验证。

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Because I masked out the BASE FILES group, I can simply drag the SKY group below the BASE FILES group and shift and scale the location until I get something that looks good.

因为我已经用蒙版隔离了基础文件组，只需要将天空组拖到基础文件组下方，之后进行适当的移动和缩放，直到得到不错的图面效果。

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He retells the terrible siege of Dien Bien Phu earlier that spring, when the North Vietnamese commander, Vo Ngu-yen Giap, made thousands of porters drag artillery into the hills surrounding a French base, from where they pounded the foreign army.

ECONOMIST: The first Vietnam war