The difference is that the process is wrapped by a loop that iterates across the saved vector of declared languages.
差别在于这个处理是由循环包围的，该循环迭代跨越已声明语言所保存的向量。
2
Now, an important difference between curl here and curl in the plane is that now the curl of a vector field is again a vector field.
和平面上的旋度的一个重要的不同点是，这里向量场的旋度，仍然是一个向量场。
3
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.