Book I chapter 18

Inasmuch as a proper solution is an exposure of false reasoning, showing on what kind of question the falsity depends, and whereas¹ ‘false reasoning’ has a double meaning-for it is used either if a false conclusion has been proved, or if there is only an apparent² proof and no real one-there must be both the kind of solution just described,’ and also the correction of a merely apparent proof, so as to show upon which of the questions the appearance depends. Thus it comes about that one solves arguments that are properly reasoned by demolishing³ them, whereas one solves merely apparent arguments by drawing distinctions. Again, inasmuch as of arguments that are properly reasoned some have a true and others a false conclusion, those that are false in respect of their conclusion it is possible to solve in two ways; for it is possible both by demolishing one of the premisses asked, and by showing that the conclusion is not the real state of the case: those, on the other hand, that are false in respect of the premisses can be solved only by a demolition⁴ of one of them; for the conclusion is true. So that those who wish to solve an argument should in the first place look and see if it is properly reasoned, or is unreasoned; and next, whether the conclusion be true or false, in order that we may effect the solution either by drawing some distinction or by demolishing something, and demolishing it either in this way or in that, as was laid down before. There is a very great deal of difference between solving an argument when being subjected to questions and when not: for to foresee traps is difficult, whereas to see them at one’s leisure is easier.

1 whereas   

conj.而，却，反之

参考例句：

• They want a house,whereas we would rather live in a flat.他们想要一座房子，而我们宁愿住在一套房间里。
• Some praise him,whereas others condemn him.有些人赞扬他，而有些人谴责他。

2 apparent   

adj.表面上的，貌似真实的，显然的，明明白白的

参考例句：

• The apparent truth was really a lie.表面上看似实话，实际上是个谎言。
• His guilt is apparent to all.他的罪恶尽人皆知。

3 demolishing   

v.摧毁( demolish的现在分词 )；推翻；拆毁（尤指大建筑物）；吃光

参考例句：

• The machine was designed specially for demolishing old buildings. 这种机器是专为拆毁旧楼房而设计的。 来自《用法词典》
• Conventional demolishing work would have caused considerable interruptions in traffic. 如果采用一般的拆除方法就要引起交通的严重中断。 来自辞典例句

4 demolition   

n.破坏,毁坏,毁坏之遗迹

参考例句：

• The church has been threatened with demolition for years. 这座教堂多年来一直面临拆毀的威胁。
• The project required the total demolition of the old bridge. 该项目要求将老桥完全拆毁。