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3. Voluntary Service: At the moment, many young and middle-aged people in rural areas are working in the coastal areas of Guangdong. Most of the people who stay at home are old, weak, women and children. Naturally, they will encounter many difficulties in life and study. We will call on our volunteers to do what they can for these lonely, elderly and left-behind children and bring them some real help and convenience.江湖早已不再平静，偏安一隅的五圣教屡遭加害，破败的枫华谷村庄莫名异动。重出江湖的阿萨辛，新登场的曲云和阿亮……流落清水岛数年的沈剑心突然遇袭，这次他又会面临怎样的危机？Note: The singleton methods used in Android source code include: InputMethodManager, AccessibilityManager, etc. all use this singleton mode.言毕转身就走。The sockstreet attack first completes the tcp three-way handshake the tcp connection is established, but in the last ack reply of the three-way handshake, the attacker sets its tcp window to 0 and then makes a data request. When the target discovers that the TCP window size at the receiving end is 0 when transmitting data, it will stop transmitting data and issue a TCP window probe packet to ask the attacker if its TCP window has been updated. Since the attacker does not change the size of the tcp window, the target will always maintain the tcp connection waiting for data to be sent and continuously carry out window update detection. If the attacker uses a large number of controlled hosts to carry out sockstreet attacks, the target will always maintain a large number of tcp connections and carry out a large number of window update detection, and its tcp connection table will gradually run out.