two dimensional vector space 二维向量空间
In an infinite dimensional space there always exist two subspaces whose vector sum is different from their span.
在一无限空间中恒存在两个子空间，其矢量和与其张成空间不同。
By using backward difference of space-time intensity correlation function with respect to time delay, the two-dimensional velocity vector of a moving diffuser can be measured.
利用远场时变散斑空-时强度相关函致的有限差商可以测量散射体运动的二维速度矢量。
It is hard to draw in two dimensions a picture of a vector function in three-dimensional space.
在两维图上画三维空间的矢函数图形是件难事。
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