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Generally speaking, a delegate is a class that maintains a field inside and points to a method. Events can be regarded as variables of one delegate type, and multiple delegates or methods are cancelled through event registration. This article uses delegate and event execution methods to understand the difference between the two.During the "Double Eleven" period, not only colleges and universities, but also community express delivery was popular. The workload of these couriers is several times that of normal times. According to the forecast of the State Post Office, more than 1.5 billion packages may be generated during the "Double Eleven" this year. It is estimated that the annual express delivery volume will reach 40 billion pieces. If calculated according to the population of 1.3 billion, that is equivalent to an average of more than 30 express deliveries per person. The huge volume of express delivery has also brought about a large consumption of express packaging. In 2015, China's express delivery industry consumed about 9.922 billion packing boxes and 8.268 billion plastic bags. The total length of adhesive tape used was 16.985 billion meters, which could make 425 circles around the equator of the earth. So what will everyone do with these express packages after these express deliveries are delivered? During the interview, some citizens told reporters that "they usually threw it away" and the fillers in the express box were usually thrown away together with the packing box.非常識宴会 石黒賢 河原さぶ这都是大哥逼我练的结果。她自来跟公婆相处就好，当下也不顾忌，反问道：咱们干嘛要学旁人？张老太太道：那咱们也不能太出格，不能走了大样子哩。小姐妹们之间彼此有些暧昧怀疑是lesbian，友达以上恋人未满还是真百合。——橘里橘气译制组