constant circulation 定向循环 ; 定常循环 ; 稳定循环
non-constant circulation index 变环量指数
constant circulation flow pattern 等环量流型
·2,447,543篇论文数据，部分数据来源于NoteExpress
But the constant circulation of Somali-Americans back to Somalia to visit family or conduct business makes it hard for American intelligence to track would-be jihadists.
ECONOMIST: Somalia and the United States: What's to be done? | The
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