Specifies the number of documents to return in each response from MongoDB指定MongoDB每次响应中返回的文档数
return BSON regular expressions as BSONRegExp instances.返回BSON正则表达式作为BSONRegExp实例。
the serializer will check if keys are valid.序列化程序将检查键是否有效。
Comment to apply to the operation.要应用于操作的注释。
In server versions pre-4.4, 'comment' must be string. 在4.4之前的服务器版本中，“comment”必须是字符串。A server error will be thrown if any other type is provided.如果提供任何其他类型，将引发服务器错误。
In server versions 4.4 and above, 'comment' can be any valid BSON type.在4.4及以上版本的服务器中，“comment”可以是任何有效的BSON类型。
Enable utf8 validation when deserializing BSON documents. 反序列化BSON文档时启用utf8验证。Defaults to true.默认为true。
allow to specify if there what fields we wish to return as unserialized raw buffer.允许指定是否存在我们希望作为非序列化原始缓冲区返回的字段。
serialize will not emit undefined fields (default:true)序列化不会发出未定义的字段（默认值：true）
When applicable 在适用的情况下，maxAwaitTimeMS controls the amount of time subsequent getMores that a cursor uses to fetch more data should take. (ex. cursor.next())maxAwaitTimeMS控制游标用于获取更多数据所需的后续getMore时间。（例如cursor.next()）
When applicable 适用时，maxTimeMS controls the amount of time the initial command that constructs a cursor should take. (ex. find, aggregate, listCollections)maxTimeMS控制构造游标的初始命令所需的时间。（例如查找、聚合、列表集合）
when deserializing a Binary will return it as a node.js Buffer instance.当反序列化Binary时，它将作为nodejs Buffer实例返回。
when deserializing a Long will fit it into a Number if it's smaller than 53 bits当反序列化Long时，如果Long小于53位，它将适合Number
when deserializing will promote BSON values to their Node.js closest equivalent types.当反序列化将把BSON值提升到它们的Node.js最接近的等效类型时。
Return BSON filled buffers from operations从操作返回BSON填充的缓冲区
serialize the javascript functions (default:false).序列化javascript函数（默认值：false）。
By default, MongoDB will automatically close a cursor when the client has exhausted all results in the cursor. 默认情况下，当客户端用尽游标中的所有结果时，MongoDB将自动关闭游标。However, for capped collections you may use a Tailable Cursor that remains open after the client exhausts the results in the initial cursor.但是，对于封顶集合，您可以使用一个Tailable游标，该游标在客户端耗尽初始游标中的结果后保持打开状态。
Generated using TypeDoc
If awaitData is set to true, when the cursor reaches the end of the capped collection, MongoDB blocks the query thread for a period of time waiting for new data to arrive.如果awaitData设置为true，当游标到达带上限集合的末尾时，MongoDB会阻塞查询线程一段时间，等待新数据到达。When new data is inserted into the capped collection, the blocked thread is signaled to wake up and return the next batch to the client.当新数据被插入到有上限的集合中时，被阻塞的线程会被通知唤醒并将下一批返回给客户端。