从化学计量向贫燃料状态靠近时，预混火焰强度减弱，火焰传播速度 减小，锥形火焰面逐渐增高，退到流速较低的下游区域；
When the CH4-air mixture approaches the lean fuel state, the flame speed accordingly decreases, the flame cone rising and retreating downstream to the area with lower flow speed.
各个乏燃料池的状态还不清楚，这种情况令人不安。
The status of the various spent fuel stashes is not clear, which is disturbing.
然而，要到达26万亿英里之外的半人马座阿尔法星，携带和储存足够量的反物质难度极大，这种燃料不仅状态不稳定，而且耗资不菲。
However, getting enough antimatter for the 26 trillion-mile, one-way trip to Alpha Centauri and storing such a volatile fuel for long periods is prohibitively expensive and difficult.
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