我有一个txt文档，其中的分隔符是~和空格，我想导入，但是由于变量有500多个，太多了，不知道怎么导入比较好，可以筛选其中的某几个变量 进行导入吗？  导入得我实在恶心死了。。。SAMPLEID~PROJECTID~NAME_B_1~PID_B_1~CFPS2012_TIME~RESIDENCE2012~NAME_DECEASEDSIBLING_A_1~TITLE_DECEASEDSIBLING_A_1~NAME_DECEASEDSIBLING_A_2~TITLE_DECEASEDSIBLING_A_2~NAME_DECEASEDSIBLING_A_3~TITLE_DECEASEDSIBLING_A_3~NAME_DECEASEDSIBLING_A_4~TITLE_DECEASEDSIBLING_A_4~NAME_DECEASEDSIBLING_A_5~TITLE_DECEASEDSIBLING_A_5~NAME_DECEASEDSIBLING_A_6~TITLE_DECEASEDSIBLING_A_6~NAME_DECEASEDSIBLING_A_7~TITLE_DECEASEDSIBLING_A_7~NAME_DECEASEDSIBLING_A_8~TITLE_DECEASEDSIBLING_A_8~NAME_DECEASEDSIBLING_A_9~TITLE_DECEASEDSIBLING_A_9~NAME_DECEASEDSIBLING_A_10~TITLE_DECEASEDSIBLING_A_10~MAINJOB_2012~LATEST_INTERV~NAME_A_1~PID_A_1~NAME_A_2~PID_A_2~NAME_A_3~PID_A_3~NAME_A_4~PID_A_4~NAME_A_5~PID_A_5~NAME_A_6~PID_A_6~NAME_A_7~PID_A_7~NAME_A_8~PID_A_8~NAME_A_9~PID_A_9~NAME_A_10~PID_A_10~NAME_A_11~PID_A_11~NAME_A_12~PID_A_12~NAME_A_13~PID_A_13~NAME_A_14~PID_A_14~NAME_A_15~PID_A_15~NAME_A_16~PID_A_16~NAME_A_17~PID_A_17~NAME_A_18~PID_A_18~NAME_A_19~PID_A_19~NAME_A_20~PID_A_20~NAME_A_21~PID_A_21~NAME_A_22~PID_A_22~NAME_A_23~PID_A_23~NAME_A_24~PID_A_24~NAME_A_25~
就像这样的形式的txt 格式。。。