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2) It is difficult to duplicate the development environment or the hardware of the development environment fails, and it takes a lot of time and energy to re-establish the development environment.1. For all ships:To better understand the concept of bubbling, I suggest you imagine a glass of water in front of you now. However, this glass of water is a little different from what we usually see. It is divided into several layers, and each layer is divided into one or more areas. The top layer is the familiar window object (i.e. Window object), the next layer is divided into several areas (document object, history object, etc.), and the next layer of document object is divided into several sub-objects.吸血丸是一只喜欢吸人血，到处都有的普通蚊子。相对的，信男是一个最讨厌被吸血的普通上班族。吸血丸最喜欢主角信男的血的味道，为了寻求美味的血每天追著主懦。信男也为了不输给那些虫而顽强抵抗，不过… 描述著吸与被吸，没有终结的攻防战，最终彼此产生了微妙的信赖感与爱的氛围。这是一部带给你新感官的贫血必死动画！　　四女儿长得不好看，姐姐们一个个都是大美人，名字也很漂亮，但是她连名字都很老土，但是并不自卑，是个Many of the big V's who participate in Oppo topics and hold Oppo mobile phones are Oppo partners.2064