📝
C242 · 复杂句（76 课）
Medical researchers have focused on causes of diseases and t
Course 242
(难)Medical researchers have focused on causes of diseases and treatments.
1 句 · 父母与孩子分角色配音
旁白 neutral
Medical researchers have focused on causes of diseases and treatments
医学研究人员一直致力于研究疾病的病因和治疗方法
