1 “.... The congress has been held twice, in Los Angeles, USA for the first and in Changchun, China for the second time...”

2 “.... The congress has been held twice, in Los Angeles, USA for the first and in Changchun, China for the second time...”

3 “.... The congress has been held twice, in Los Angeles, USA for the first and in Changchun, China for the second time...”

4 “.... The congress has been held twice, in Los Angeles, USA for the first and in Changchun, China for the second time...”

5 “.... The congress has been held twice, in Los Angeles, USA for the first and in Changchun, China for the second time...”

6 “.... The congress has been held twice, in Los Angeles, USA for the first and in Changchun, China for the second time...”