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"'let the dog bite '? Is the" dog "you said a real dog or something else that behaves like a dog?" I have some experience in hearing this, He interrupted and asked again in a "sure" tone. The reason for this is that in the interview at position 169, Qi Shicheng mentioned that the Vietnamese army's humanoid monster in tattered military uniform was like a dog when running, so when I heard Liu Guangyuan also talking about "dog", I was not sure whether the "dog" he said was a "living biological weapon" with Qi Shicheng.那青鸾公主立即就会香消玉殒。This class can meet the basic requirements, but if we put a class like this without thread safety protection into a multi-threaded environment, there will definitely be problems. How to solve them? The first thing we think of is adding the synchronized keyword to the getInstance method, as follows:有什么没想好的么？有。3. Reflection and amplification attack (DEDoS) (ack reflection attack, dns amplification attack)大概如此，当地人种在山地居多。