In this method eight voltage controlling vectors are summarized, four vectors of which are selected to control a motor.

针对四开关逆变器没有零电压控制矢量的特点，提出了回扫延时的概念。

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When filtering, the new E-mail was compared with four center vectors respectively to decide which class it belonged to.

过滤过程则将新进来的邮件分别与四个小类的类中心向量进行相似度比较，最终来判定所属类别。

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This article, on the basis of four dimensional coordinates and four dimensional wave vectors of world space, proves the phrase constancy of electromagnetic waves.

作者在该文中从世界空间的四维坐标和四维波矢量出发，证明了电磁波的相位不变性。

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As a business, we've been on a very rapid transformational journey not on one vector but on three or four different vectors at the same time.

WSJ: Tata Unit Seeks Profile Boost Via F1 Deal

The Market Vectors Russia ETF ( RSX) gives investors access to four firms that are not traded on US markets: state-run oil major Rosneft, VTB Bank, Novatek and NLMK Steel.

FORBES: Russian Energy Stocks in 2011

Of the four major emerging markets, Russia has been the worst performing index, with the Market Vectors Russia (RSX) ETF down over 10%.

FORBES: Despite Sell-Off, China Internet Stocks Still Beat Gold