Book I chapter 12

It is clear then that a simple conclusion is not reached unless both premisses are simple assertions, but a necessary conclusion is possible although one only of the premisses is necessary. But in both cases, whether the syllogisms are affirmative or negative, it is necessary that one premiss should be similar to the conclusion. I mean by ‘similar’, if the conclusion is a simple assertion, the premiss must be simple; if the conclusion is necessary, the premiss must be necessary. Consequently¹ this also is clear, that the conclusion will be neither necessary nor simple unless a necessary or simple premiss is assumed².

1 consequently   

adv.因此，因而，所以

参考例句：

• She was a bright and eager student and,consequently,did well in school.她是个聪明好学的学生，因此学习成绩很好。
• The company went bankrupt and consequently he lost his job.公司破产，因此他失业了。

2 assumed   

adj.假定的, 假装的 动词assume的过去式和过去分词

参考例句：

• The assumed linearity of these equations can be related to the uniformity of space and time.所假定的这些方程的线性，可归因于空间和时间的均匀性。