One of the primary attributes of deflagration is that the flame travels at a speed significantly lower than the speed of sound.
对爆燃的主要特征之一，是火焰的速度大大低于音速的降低旅行。
More and more rockets were lightened with creaking sound and flame to rush the skies. Fifteen minutes later, the experiment was over.
一枚一枚的火箭被分别点燃并带着吱吱的声音和火焰冲上云霄，十五分钟过后试验结束。
PC board with pervious to light quality, impact resistance, heat insulation, weather resistance, prevent dewing excellence, flame retardant, sound insulation and processing function.
PC板具有透光性强、抗冲击、隔热、耐候、防结露、阻燃、隔声和超卓的加工功用等。
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