·2,447,543篇论文数据，部分数据来源于NoteExpress
They are initially empty (when the data graph is returned to a client) and populated as the data graph is modified.
变更摘要最初是空的（数据图刚返回客户机的时候），随着数据图的变化逐渐填充。
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Begin with an empty with the ID "graph".
首先给出了一个ID为“ graph ”的空。
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