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The difference between synchronous and asynchronous lies in the second stage. If the requester actively obtains the data, it is a synchronous operation. It should be noted that the read/write operation is also "blocked" until the data is read.　　二十五年前，出生贵族世家的柳朗月，原名易水云，其父易靖因不谙宫闱内斗在丧妻后携独女易水云寄居山野，后结识一奇女子莫晓兰，将她的“隐身术”传给了易水云，水云天赋异禀，颇得真传。这就是紫衫龙王黛妮思的故事。If I were to implement a pizza ordering system, I would definitely write the code like this, because this kind of code can be written subconsciously without consuming our brains. However, take a closer look at this code: the purpose of this method is to order pizza. However, the code for ordering pizza also needs knowledge about the production of pizza. This method must know all pizza. Worse still, if the types of pizza are to be expanded or pizza with poor sales volume are to be deleted in the future, then the code for ordering pizza will be modified. It looks very bad and should be revised. Our first step must be to separate the code for producing Pizza from the code for ordering pizza, because you should not let the code for ordering Pizza know the logic for producing pizza, but should hand over the logic for producing Pizza to a special type. In this way, we can cope with future changes-if we want to add or delete pizza, we can directly modify the producer of pizza without affecting the logic of ordering pizza.宇宙战舰大和号向伊坎达航行3年后的公历2202年。重新找回过去蓝色面貌的地球与卡米拉斯帝国签订和平条约，正在进行复原工作。但是，地球联邦政府正在以建立在“波动炮舰队构想”基础上的新锐战舰安德罗迈达为扩张军备，而大和原船员甚至怀疑其存在。其中一人，古代进投身于与嘉特列迪斯舰队展开战斗的地球加米拉斯混合舰队。动荡乱世敌我难分付宇锋接过这只肥兔子，一脸不高兴，小声嘀咕道：本来是买来吃的，现在却好，像大爷一样伺候着。