Two - thirds of the women surveyed had never even been on spring break 三分之二受调女性甚至从来没有过春假。
2.
After obtaining the whole loads we optimize cable tension by means of controlling cable length on the basis of influence matrix method . practical examples are presented to illustrate the process and efficiency of the method 然后利用影响矩阵的概念，令索力为受调向量，索长为施调向量，通过控制各索的长度来调整优化索力。
