But many siphons are needed for each lake, so the cost of de-gassing is high.
但是每个湖泊需要很多的虹吸管，因此提取这些气体的费用很高。
Based on the technology of rotating impeller DE gassing in aluminum alloy melt, the effect of pulse gas current on the gas bubble size by studied with the water modeling method.
在铝合金熔体净化旋转喷吹技术的基础上，采用水力模拟实验研究了脉冲进气方式对气泡大小的影响。
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