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In the field of computers, software environment refers to a software system running on computer hardware that drives computers and their peripherals to achieve a certain purpose. It also mainly refers to the running environment of the software, such as XP, Linux, and the peripheral software needed for the software to run, etc. In addition, it also includes application layer software other than the target software, which often has great influence when it comes to software interaction.…Developers use virtualenv to manage multiple development environmentsDDOS attacks mainly occur in the network layer. Its most obvious characteristic is to send a large number of attack packets, consume network bandwidth resources and affect normal users' access. At present, the detection and defense technology for DDOS attacks in the network layer is quite mature, and at the same time, some new attack methods-DDOS attacks in the application layer have emerged. Different from network layer DDOS attacks, application layer DDOS attacks mostly imitate the access behavior of legitimate users and will not generate a large number of attack data packets during data transmission, but they will consume server resources through a large number of database queries and other operations, which is more difficult to detect. According to the different attack modes, DDOS attacks include reflection amplification attacks in addition to ordinary flooding attacks. This type of attack often uses a legitimate server as a reflector, which sends a large number of data packets to the target, thus causing greater harm. At present, DDOS attacks against DNS servers are also common. Attackers often send fake domain names to DNS servers, consuming DNS server resources. At the same time, due to the recursive query mechanism in DNS servers, DDOS attacks against DNS servers have a large impact range.过了5年，近未来的东京。表面上看上去是座繁荣的巨大都市，实际上却已经走向了毁灭的边缘。两极化，犯罪都市。町田惨剧中唯一一个生还者申道兰丸，为了寻找事件的真相成为了警察。患有先天性心脏病的计，怀上了宝宝，有关爱与生命的意义，她不知自己还有多少时间去探索。玉兄、玉弟的争斗，是在老玉帝选择接班人的比武中开始的。玉兄本性顽劣，争强斗狠，不服任何人；玉弟却与玉兄性格迥异，虽聪慧过人，武功高强，却以慈善之心待人，一腔悲悯情怀。在比武中，玉弟不忍伤害玉兄，战成平手。关键时刻，玉帝笃守诚信；玉兄则不择手段，几乎成功继位。一直到加冕仪式将要开始，玉兄的凶残嘴脸才败露，仓皇逃往人间。而此时的玉弟，正默默承受着内心极度痛苦的煎熬：他要为自己的仁慈付出代价，那就是不仅失去皇位，还将失去自己心爱的水雾仙子。 　　玉帝（玉兄逃窜后，玉弟继位）是中国人心目中的理想人物。他宽厚善良，大慈大悲，疾恶如仇，不惜牺牲，拯救百姓于水火之中....