x1={{-0.0183677 - 0.000203121 I, 0. + 0. I, 0. + 0. I}, {-0.0183847 - 1.44502 I, 0. + 0. I, 0. + 0. I}, {-0.0177886 - 5.35292 I, 0. + 0. I, 0. + 0. I}, {-0.0167278 - 10.6243 I, 0. + 0. I, 0. + 0. I}, {-0.0154766 - 15.9321 I, 0. + 0. I, 0. + 0. I}, {-0.0141126 - 20.1786 I, 0. + 0. I, 0. + 0. I}, {-0.0123853 - 22.7599 I, 0. + 0. I, 0. + 0. I}, {-0.0100653 - 23.5848 I, 0. + 0. I, 0. + 0. I}, {-0.00737592 - 22.9264 I, 0. + 0. I, 0. + 0. I}, {-0.00481858 - 21.2253 I, 0. + 0. I, 0. + 0. I}, {-0.0025551 - 18.9311 I, 0. + 0. I, 0. + 0. I}, {-0.000336917 - 16.4123 I, 0. + 0. I, 0. + 0. I}, {0.00185234 - 13.9267 I, 0. + 0. I, 0. + 0. I}, {0.00362123 - 11.6282 I, 0. + 0. I, 0. + 0. I}, {0.00486789 - 9.58997 I, 0. + 0. I, 0. + 0. I}, {0.00597854 - 7.83134 I, 0. + 0. I, 0. + 0. I}, {0.00701078 - 6.33995 I, 0. + 0. I, 0. + 0. I}, {0.00748167 - 5.08648 I, 0. + 0. I, 0. + 0. I}, {0.00727484 - 4.03455 I, 0. + 0. I, 0. + 0. I}, {0.00682821 - 3.14746 I, 0. + 0. I, 0. + 0. I}, {0.00623565 - 2.39128 I, 0. + 0. I, 0. + 0. I}, {0.00519231 - 1.73505 I, 0. + 0. I, 0. + 0. I}, {0.00384464 - 1.15094 I, 0. + 0. I, 0. + 0. I}, {0.0026486 - 0.614505 I, 0. + 0. I, 0. + 0. I}, {0.00152383 - 0.103717 I, 0. + 0. I, 0. + 0. I}, {0.0000904626 + 0.402822 I, 0. + 0. I, 0. + 0. I}, {-0.00150768 + 0.926627 I, 0. + 0. I, 0. + 0. I}, {-0.00281066 + 1.48952 I, 0. + 0. I, 0. + 0. I}, {-0.0037935 + 2.11476 I, 0. + 0. I, 0. + 0. I}, {-0.00475907 + 2.82859 I, 0. + 0. I, 0. + 0. I}, {-0.0056809 + 3.66089 I, 0. + 0. I, 0. + 0. I}, {-0.00616325 + 4.64475 I, 0. + 0. I, 0. + 0. I}, {-0.00599051 + 5.81573 I, 0. + 0. I, 0. + 0. I}, {-0.00536956 + 7.21022 I, 0. + 0. I, 0. + 0. I}, {-0.00460175 + 8.86121 I, 0. + 0. I, 0. + 0. I}, {-0.003723 + 10.7899 I, 0. + 0. I, 0. + 0. I}, {-0.00253556 + 12.992 I, 0. + 0. I, 0. + 0. I}, {-0.000887977 + 15.4181 I, 0. + 0. I, 0. + 0. I}, {0.00115423 + 17.9493 I, 0. + 0. I, 0. + 0. I}, {0.00337808 + 20.3712 I, 0. + 0. I, 0. + 0. I}, {0.00559513 + 22.3583 I, 0. + 0. I, 0. + 0. I}, {0.00773308 + 23.4859 I, 0. + 0. I, 0. + 0. I}, {0.00979509 + 23.2944 I, 0. + 0. I, 0. + 0. I}, {0.0117674 + 21.4219 I, 0. + 0. I, 0. + 0. I}, {0.0135811 + 17.7926 I, 0. + 0. I, 0. + 0. I}, {0.0151558 + 12.7976 I, 0. + 0. I, 0. + 0. I}, {0.0164587 + 7.35616 I, 0. + 0. I, 0. + 0. I}, {0.0174915 + 2.7513 I, 0. + 0. I, 0. + 0. I}, {0.0182043 + 0.232501 I, 0. + 0. I, 0. + 0. I}, {0.0184511 + 0.535448 I, 0. + 0. I, 0. + 0. I}, {0.0180941 + 3.56972 I, 0. + 0. I, 0. + 0. I}, {0.0171855 + 8.45818 I, 0. + 0. I, 0. + 0. I}, {0.0159822 + 13.9042 I, 0. + 0. I, 0. + 0. I}, {0.0146772 + 18.6739 I, 0. + 0. I, 0. + 0. I}, {0.0131349 + 21.9523 I, 0. + 0. I, 0. + 0. I}, {0.011053 + 23.4564 I, 0. + 0. I, 0. + 0. I}, {0.00845255 + 23.3381 I, 0. + 0. I, 0. + 0. I}, {0.00579256 + 21.9942 I, 0. + 0. I, 0. + 0. I}, {0.00342984 + 19.8851 I, 0. + 0. I, 0. + 0. I}, {0.00122405 + 17.4181 I, 0. + 0. I, 0. + 0. I}, {-0.00101059 + 14.8957 I, 0. + 0. I, 0. + 0. I}, {-0.00299223 + 12.5104 I, 0. + 0. I, 0. + 0. I}, {-0.00441509 + 10.3643 I, 0. + 0. I, 0. + 0. I}, {-0.00553389 + 8.49499 I, 0. + 0. I, 0. + 0. I}, {-0.00663879 + 6.90054 I, 0. + 0. I, 0. + 0. I}, {-0.00738803 + 5.55694 I, 0. + 0. I, 0. + 0. I}, {-0.00741259 + 4.42964 I, 0. + 0. I, 0. + 0. I}, {-0.00701159 + 3.48147 I, 0. + 0. I, 0. + 0. I}, {-0.00650908 + 2.67728 I, 0. + 0. I, 0. + 0. I}, {-0.00566629 + 1.98497 I, 0. + 0. I, 0. + 0. I}, {-0.00438096 + 1.37539 I, 0. + 0. I, 0. + 0. I}, {-0.0030932 + 0.822792 I, 0. + 0. I, 0. + 0. I}, {-0.00199049 + 0.304404 I, 0. + 0. I, 0. + 0. I}, {-0.000701722 - 0.201253 I, 0. + 0. I, 0. + 0. I}, {0.000887669 - 0.715635 I, 0. + 0. I, 0. + 0. I}, {0.00234519 - 1.26038 I, 0. + 0. I, 0. + 0. I}, {0.00342188 - 1.85797 I, 0. + 0. I, 0. + 0. I}, {0.00436794 - 2.53332 I, 0. + 0. I, 0. + 0. I}, {0.00534377 - 3.31489 I, 0. + 0. I, 0. + 0. I}, {0.00604854 - 4.23456 I, 0. + 0. I, 0. + 0. I}, {0.00613144 - 5.32703 I, 0. + 0. I, 0. + 0. I}, {0.00564641 - 6.62869 I, 0. + 0. I, 0. + 0. I}, {0.00491371 - 8.17461 I, 0. + 0. I, 0. + 0. I}, {0.00409493 - 9.99199 I, 0. + 0. I, 0. + 0. I}, {0.00305685 - 12.0886 I, 0. + 0. I, 0. + 0. I}, {0.00159664 - 14.4357 I, 0. + 0. I, 0. + 0. I}, {-0.000310226 - 16.9451 I, 0. + 0. I, 0. + 0. I}, {-0.00248954 - 19.4429 I, 0. + 0. I, 0. + 0. I}, {-0.00472474 - 21.6484 I, 0. + 0. I, 0. + 0. I}, {-0.00689578 - 23.1718 I, 0. + 0. I, 0. + 0. I}, {-0.00898678 - 23.5554 I, 0. + 0. I, 0. + 0. I}} 这是我在软件中计算得到的数据 Export["da.txt", x1] 这里将数据导出保存 x2=Import["da.txt"]; 在数据保存之前x1的head属性是List，但是我将数据保存后再次导入调用时，数据的Head属性变为String，我该怎么保存数据才能使数据导入之后和原来的结构一模一样。我也试着将数据的导出格式变为.dat，但是数据导入之后还是没办法利用
