为了解决上面两个方面的问题，近十几年以来，国内外对旋流式内消能工进行了较多的试验研究与设计方案论证。
In order to solve above mentioned two kind problems, in recent years, many test researches and designing schemes have been done aimed at internal dissipater with swirling flow.
为了解决上面两个方面的问题，近十几年以来，国内外对旋流式内消能工进行了较多的试验研究与设计方案论证。
In order to solve above mentioned two kind problems, in recent years, many test researches and designing schemes have been done aimed at internal dissipater with swirling flow.
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