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The songs were simple and easy to understand.
VOA: special.2009.05.11
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It's not easy to devise this and the concept is very simple.
设计保单并不那么容易,仅仅一条概念太单薄了。
耶鲁公开课 - 金融市场课程节选
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It's not easy to devise this and the concept is very simple.
设计保单并不那么容易,仅仅一条概念太单薄了。
耶鲁公开课 - 金融市场课程节选
