Data missing in this field 此栏遗漏数据
Covering indexes allow data storage within the index itself while sparse indexes exclude documents that do not contain the missing field.
Covered索引允许在索引本身里存储数据,而Sparse索引则会排除掉不包含索引字段的文档。
If you just compare the pattern between a typical control and Mike, you can see that Mike is missing a lot of the responses in the very centre of the visual field.
如果将控制组和迈克的模型相比较,大家能够看出,迈克的视野中心缺少许多反应。
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