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So they flew through a flaw in the flue.
就这样，牠们就飞越了烟道里的一条裂纹。
youdao
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In the process air is replaced by pure oxygen, and flue gas is recycled.
该技术以纯氧代替空气，并与烟气再循环相结合。
youdao
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In the process air is replaced by pure oxygen, and flue gas is recycled.
该技术以纯氧代替空气，并与烟气再循环相结合。
youdao