counter circulation coring 反循环取心
pneumatic counter-circulation 气动反循环
circulation counter current 逆流循环
circulation counter 循环计数器
Due to unstable sea level, drilling by using 6bs counter circulation pump is not very suitable.
在浅海岸边进行钻机作业，由于海平面水位不稳定，采用6 BS反循环泵已不合适。
Some superiorities of using down hole hammer counter circulation type continuous coring (sampling) method in gold ore exploration are expounded in this paper.
文中阐述了在金矿勘探中应用潜孔锤反循环连续取心（样）的优越性；
For these reasons, a half-close and clockwise or counter-clockwise flow circulation is formed at the north of the bay during tide falling or rising.
因此，涨潮时北半部形成一个半封闭式的逆时针向环流，落潮时则形成半封闭式的顺时针向环流。
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