The numerical simulation also indicated that secondary cold gas injection had very obvious effects on the surface wall about the exit of the nozzle diffuse.
二次冷喷流对喷管扩散段出口附近壁面有非常明显的冷却作用。
youdao
It's only a low wall—about a metre high.
那只不过是一堵矮墙—约一米高。
《牛津词典》
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