研究中会出现类似拼图游戏(jig-saw puzzle)中所有拼块各就其位的那一刻(尽管并非总是如此)。但研究又不像拼图游戏那样,所有拼块都近在手边,且只能拼成一种图形(也正因如此,每一步的正确性是可以即刻确定的);研究中只能得到一部分拼块,并且从理论上来讲,从中所得的图形也远不止一种。事实上,把拼图游戏中的拼块,或多或少有意地当作建造游戏中的模块来使用,这总归是冒险的。因此,一切各就其位也 The moments (although not always) of all puzzles in the jig-saw puzzle will appear in the study. But research is not like jigsaw puzzles. All the pieces are close at hand and can only be combined into one type of figure (for this reason, the correctness of each step can be determined instantly); only a part of the pieces can be obtained in the study. And, theoretically speaking, there are more than one kind of graphs derived from it. In fact, the use of puzzles in jigsaw puzzles, which are more or less intentionally used as building blocks in the game, is always risky. So everything is in its place