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C126 · 普通句（141 课）
Purity is one feature that makes gold expensive.
Course 126
(普)Purity is one feature that makes gold expensive.
1 句 · 父母与孩子分角色配音
旁白 neutral
Purity is one feature that makes gold expensive
纯度是使黄金昂贵的一个特性
