... convergence control 聚焦调整,收敛控制,... convergence zone 会聚区 beam convergence 束会聚,聚束,射束会...
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观察30例显示血流会聚区（FCR）的偏心性二尖瓣返流患者的返流束形态，发现均为附壁细长束。
The shape of regurgitant jets in 30 patients with eccentric mitral regurgitation showing now convergence region (FCR) was observed.
结果发现：33／52（63％）例生理性二尖瓣返流和87／87（100％）例病理性二尖瓣返流可于二尖瓣左室面显示血流会聚区；
Flow convergence region, which was located in the left ventricular sides of mitral valve, was displayed in 63%(33/52)of physiological MR and 100%(87/87) of pathological MR.
科学家们的解释则是，有些北极熊由于饥饿可能会聚集在人类居住区周围。这就导致人们产生一种错觉，误认为北极熊的数量比其实有数量要多。
Scientists have responded by noting that hungry bears may be congregating around human settlements, leading to the illusion that populations are higher than they actually are.
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