这由TCP的半关闭(half close)特性造成的。既然一个TCP 连接是双工的(即数据在两个方向上能同时发送、接收)，因此每个方向上要单独的进行关闭 。
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half-close 半关闭 ; 半关闭状态
half-close vowel 半闭母音
half close vowel 半闭元音
half-close condition 半封闭状态
half close-loop control 半闭环控制
THE HALF NELSON CLOSE 假定法
half astern close 半休止
close half plane 闭半平面
Close to half past two 接近二点半
He liked to half close his eyes.
他喜欢半闭着眼睛。
youdao
He likes to half close his eyes.
Close to half of deposits in China are demand deposits.
中国将近有一半的存款都是活期存款。
But close to half a million confirmed cases were reported to the World Health Organization as of November first.
VOA: special.2009.11.11
Then the first man would speak for half an hour to close the debate.
VOA: special.2009.06.11
Ospreys went close to scoring as the first half drew to a close, but full-back Gareth Owen lacked support following a promising opening.
BBC: Edinburgh 33-17 Ospreys
He thinks panel prices in the second half will remain close to the break-even level for the manufacturers.
FORBES: With LCD TV Sales Weak, Goldman Downgrades LPL, AUO
The first half was something close to a disaster: Bucks forward Mike Dunleavy went bonkers, scoring 24 points on 9-of-10 shooting.
WSJ: Knicks in Agony as They Seek Ecstasy
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