Constructs a ReadConcern from the read concern level.从读取关注级别构造ReadConcern。
Construct a ReadConcern given an options object.构造一个给定选项对象的ReadConcern。
The options object from which to extract the write concern.从中提取写关注点的options对象。
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The MongoDB ReadConcern, which allows for control of the consistency and isolation properties of the data read from replica sets and replica set shards.MongoDB ReadConcern，允许控制从副本集和副本集分片读取的数据的一致性和隔离属性。https://docs.mongodb.com/manual/reference/read-concern/index.html