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| Three days' spring excursion at Badaling |
| From May 22nd to 24th, 2009, all the group members went to Badaling for spring excursion. During the excursion, we visited the Longqing Xia and had a barbeque party at Prof. Xi’s home. |
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| Longqing Xia |
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| Barbecue |
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| “Ordered Self-Assembly” (enlarge) |
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