Flame in the field must be a clear position and should have good vision, the best in the General Assembly can also see the flameoff-site suitable.
圣火必须位于大会场的明显位置，并应具有良好的视野，最好在大会场外也能看到圣火为宜。
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But what they noticed was that even when they turned the flameoff they were still getting a signal - in other words, the laser was breaking up as well as exciting the oxygen.
Besides, the excess air or excess load will cause flame lift, combustion exacerbation and flameoff, and that needs auxiliary flame and flame retention by inactive substance.