以前，历史是他最弱的一科，但是赵大爷却对它很感兴趣，他们常常谈论。
Previously history was his weakest subject, but it is a subject which interests Mr Zhao and they often discuss it.
赵燕菁、吴伟科，住宅供给模式与社会财富分配《城市发展研究》，2007年第5期。
Zhao Yanjing, Wu Weike. Residences Supply Mode and Social Properties Distribution. Urban Studies. 2007. (5).
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