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Although online children's thinking ability training institutions frequently raise funds, their companies have not been established and developed for a long time, most of which were established in 2017 and 2018. However, Growth Insurance is an earlier company established in the field of online mode thinking ability training, which was established in 2015.照例这是句场面话。During the establishment of a tcp connection, If the server returns syn and ack messages, The client does not confirm it for some reason. This is because the server needs to retransmit the syn + ack message and wait for the client's confirmation message until the tcp connection timeout. This state of waiting for the client to confirm the connection is usually called a half-open connection. The half-open connection will be kept in the connection table of the server until the connection is disconnected.花园里，一男一女两个孩子互相追逐，其乐融融，玩的十分开心。