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C265 · 复杂句（76 课）
Many diseases that were once serious have now been eradicate
Course 265
(难)Many diseases that were once serious have now been eradicated.
1 句 · 父母与孩子分角色配音
旁白 neutral
Many diseases that were once serious have now been eradicated
许多曾经严重的疾病如今已被根除
