And, the way we can get it, so, it's called usually V, so, V here stands for velocity more than for vector. And, you just get it by taking the derivative of a position vector with respect to time.

根据它的原理，我们通常用v表示,这里的V更代表速率而不是矢量，你能通过,对一个关于时间的位置向量求导得到它。

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Precision V type rack can also be used with a gripping, party box bow frame, can put a V type cylindrical workpieces firm grip in V type shelf, flip to each position crossed.

精密V型架也可作方箱使用，带有夹持弓架的V型架，可以把圆柱形工件牢固的夹持在V型架上，翻转到各个位置划线。

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The existing forms of Ni and V and its position for the latter process are discussed. The removal methods of Ni and V are recounted in detail.

讨论了镍和矾在原油中的存在形态，以及对石油后续加工造成的危害。

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This whole deal is about Clearwire and its V A S T spectrum position.

FORBES: Softbank's Brilliant Buy One (Sprint), Get One Free Deal (Clearwire)

The defeat ended a miserable week for Saracens, who have become embroiled in a club v country row over which position former Great Britain rugby league captain Andy Farrell should play.

BBC: SPORT | Rugby Union | My Club | Saracens | Saracens 29-40 Blues

"I think it's important for me to be playing in one position, " Hook told BBC Wales' Scrum V show.

BBC: Hook asks to be Ospreys' fly-half