断开连接（四次挥手） 主动关闭（active close）：某个应用程序首先调用close，发送一个FIN包。 被动关闭（passive close）：接收到FIN的对端执行被动关闭。
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主动脉瓣关闭不全 aortic insufficiency ; Aortic incompetence ; aortic regurgitation ; aortic stenosis
慢性主动脉瓣关闭不全 Chronic aortic insufficiency
急性主动脉瓣关闭不全 acute aortic insufficiency
引擎主动开启关闭功能 Start-Stop function
主题自动关闭 auto close
及主动脉瓣关闭不全 Aortic insufficiency
轻度主动脉瓣关闭不全 aortic regurgitation
主动脉关闭不全 aortic insufficiency
主动脉(瓣)关闭不全 Aortic (valve) insufficiency
这是服务器主动关闭连接的唯一情况。
This is the only case in which the server closes a connection to a client.
为保证广大会员有一个宁静的习练环境，请勿在场馆内大声喧哗，进入教室前请主动关闭手机；
In order to guarantee all the members have a quiet practice environment, you must keep quiet in Venues. Close your phones before you come into the class.
关闭学校可以作为采取的积极主动措施，目的是减少疾病在校内的传播并减少向更广泛的社区进行扩散。
School closure can operate as a proactive measure, aimed at reducing transmission in the school and spread into the wider community.
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