From March 23 to April 13 in 2019, doctorMeilingTong and Yaqin Xu from department of Child Health Care attended the 2019 annual meeting of the American association of hearing (AAA) and visited the United States Pacific University (University of Pacific, referred to as "UOP) hearing division.They listened to lectures and observed audiology research front of central auditory processing disorder (CAPD) evaluation, and studied in the local speech language training center (Sound),helpingthe evaluation, diagnosis and training of children's language development.