选出应填入下面一段英语中______内的正确答案。 One of the most difficult problems with systems (1)
选出应填入下面一段英语中______内的正确答案。
One of the most difficult problems with systems(1)is understanding and(2)patterns that will be jointly achieved by the components of a system. To understand this term, think of a(3)like a mouse click that triggers some chains of causally related responsibilities performed in software. One way of looking at this is from outside the system,a mouse click causes a file icon to open on a screen. Another way to view this is from inside, the responsibilities of handling the click are decentralized in a set of objects in a running program and the click(4)through this set by means of a causally connected sequence ofinterobject(5). One ofthe objects causes the file icon to open on the screen.