huǒ / jiàn / fā / shè / hòu / wěi / bù / de / yǔ / liú / zài / tiān / kōng / zhōng / qīng / xī / kě / jiàn

火箭发射后，尾部的羽流在天空中清晰可见。

The plume at the tail of the rocket is clearly visible in the sky after launch.