ACK
abbr. 命令正确应答；确认字符（acknowledgement character）
例句
Ack! Same problem!
同样的问题又发生了！
This ACK indicates that all messages have been received.
ACK表明所有的消息都已经收到了。
Ack: Indicates that the acknowledgment number field is significant.
ACK：表明确认号字段是有意义的。
