"子丹"是个多义词，它可以指赵子丹（天津大学教授）,赵子丹（太行书画院院长）。
起初，我们了解俞子丹只是因为他教书的才能。
At first, we come to know Yu Zidan for his teaching talents.
你要向金龟子丹尼证明你很聪明，便把我们的秘密告诉了他。
You wanted to show Danny Dung beetle how clever you were. So you told him our secret.
介绍了引丹灌区工程概况，分析了排子河渡槽止水修补设计和施工工艺。
This paper introduces the general situation of the engineering of Yindan Irrigation Area, and analyzes the design and construction technology of waterstop repair in Paizihe aqueduct.
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