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。
A flea and a fly flew up in a flue.
一只跳蚤和一只苍蝇飞进了烟道里。
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。
A flea and a fly flew up in a flue.
一只跳蚤和一只苍蝇飞进烟道里。跳蚤说：“让我们飞吧！”
A flea and a fly were in a flue.
跳蚤和苍蝇进了烟道。
A flea and a fly were in a flue.
跳蚤和苍蝇进了烟道。
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