Technical Training And Aid技术培训与援助
practical training aid实务训练的教具
speech training aid言语训练器
ground training aid地面训练辅助设备
training aid write training说写训练
sonar training aid水声训练设备
Golf Training Aid高尔夫球训练援助
scientific training aid factory科技教具厂
auditory training aid电子视觉听觉训练辅助设备