//比ObjectID(61c95ab443205b1826b348cf)小的文档集合
find({"_id":{$lt:ObjectId('61c95ab443205b1826b348cf')}})
//比ObjectID(61c95ab443205b1826b348cf)大的文档集合
find({"_id":{$gt:ObjectId('61c95ab443205b1826b348cf')}})
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//比ObjectID(61c95ab443205b1826b348cf)小的文档集合
find({"_id":{$lt:ObjectId('61c95ab443205b1826b348cf')}})
//比ObjectID(61c95ab443205b1826b348cf)大的文档集合
find({"_id":{$gt:ObjectId('61c95ab443205b1826b348cf')}})
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