Test defining string concatenation operation
Test defining string concatenation operation

xnning/fcore,wxzh/fcore,wxzh/fcore,bixuanzju/fcore,hkuplg/fcore,bixuanzju/fcore,hkuplg/fcore,wxzh/fcore,zhiyuanshi/fcore,bixuanzju/fcore,zhiyuanshi/fcore,zhiyuanshi/fcore,xnning/fcore,xnning/fcore,hkuplg/fcore