primary recovery

• 最初回收率,一次回收率,初次回采,初次开采,一次采油

primary recovery的用法和样例：

例句

1. The present situation of pilot tests for enhanced oil recovery by employing petroleum sulfonates worldwide issummarized.
   综述了国内外应用石油磺酸盐进行三次采油矿场试验的研究现状。