📝
C023 · 简单句（95 课）
The history of economics is a tricky subject to study.
Course 023
(简)The history of economics is a tricky subject to study.
1 句 · 父母与孩子分角色配音
旁白 neutral
The history of economics is a tricky subject to study
经济学史是一门难以研究的话题
