结果表明，脉冲co 2激光功率密度经三次反射激光聚焦系统达到空气击穿阈值，实验中观察到等离子体发光现象。
The results show: pulse power density from CO2 laser reaches air breakdown threshold through thrice reflecting focus system, and plasma radiation phenomena is observed in the experiment.
这第三次的叩声，在冷空气中扩散开来，格外地响，颇带些凄厉的气氛。
This third time, the knocking seemed to spread through the cold air, more penetrating than ever, bringing with it a sense of mournful desolation.
这第三次的叩声，在冷空气中扩散开来，格外地响，颇带些凄厉的气氛。
This third time, the knocking seemed to spread through the cold air, more penetrating than ever, bringing with it a sense of mournful desolation.
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