Dynamic focus voltage error of projection display system was studied in this article. Parabola dynamic focus method, projection tube shape and optics processing were analyzed.

从投影显示系统典型的动态聚焦方法与投影管特殊的荧光屏结构以及光学处理等方面对投影显示系统的动态聚焦电压误差进行研究。

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Research communities are fast replacing the focus group as the preferred method for discovering or testing new products concepts.

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Not necessarily a better method, but an alternative method that will focus on probability of victory rather than the margin of victory based on resources in hand.

BBC: Duckworth hits back at SA

The staff plan also made clear that the study was to focus not just on the selection method of the at-large board seats but also on whether such members were needed at all.

CNN: Group overseeing Internet changes sets its election rules