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。
Different control policies will be taken toward elementary and dependent siphons.
对基本信标和从属信标采用不同的控制策略。
Different control policies will be taken toward elementary and dependent siphons.
对基本信标和从属信标采用不同的控制策略。
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