Even in that strangling feudalism, even in that fire of imperialism, the Chinese people are still the backbone of their own has risen up the ancient Great Wall of China.
即使在那封建主义的绞杀下，即使在那帝国主义的炮火中，中国人依然用自己的脊梁挺起了中华古老的长城。
The swirl number of secondary air has a great influence on the combustion. When swirl number is small(S<0.8), the fire is long, and may rush the back wall.
二次风旋流强度的变化对炉内燃烧影响较大，旋流数过小时（S<0.8），火焰将冲刷后墙；
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