上句见：Day272
The Story of Philosophy《哲学的故事》第1章Plato第4节IV. The Ethical Problem第6段第6句：

How does Socrates — i.e., Plato — meet the challenge of this theory? At first he does not meet it at all. He points out that justice is a relation among individuals, depending on social organization; and that in consequence it can be studied better as part of the structure of a community than as a quality of personal conduct. If, he suggests, we can picture a just state, we shall be in a better position to describe a just individual. Plato excuses himself for this digression on the score that in testing a man's vision we make him read first large type, then smaller; so he argues, it is easier to analyze justice on a large scale than on the small scale of individual behavior. But we need not be deceived: in truth the Master is patching two books together, and uses the argument as a seam. He wishes not only to discuss the problems of personal morality, but the problems of social and political reconstruction as well. He has a Utopia up his sleeve, and is resolved to produce it. It is easy to forgive him, for the digression forms the core and value of his book.
浙江大学译本：然而我们不应被他蒙骗：事实上， 这位哲学大师要把这个论证作为接合线来缀合两部书。

解析

1、 But we need not be deceived: in truth the Master is patching two books together, and uses the argument as a seam.
但我们不应被骗：事实上，这位大师是用这个论点作为接合线将两本书拼凑起来。
patch…together: to put (something) together usually in a quick or careless way拼凑
Miguel was huddled over a makeshift guitar patched together from an old soundboard and other random items. 米格正蜷缩在一把他自己做的吉他旁边，那把吉他是他用一块旧的共鸣板和其他七零八落的零件拼凑而成的。《寻梦环游记》
seam: a line where two pieces of cloth or other material are sewn together.线缝
"You must take apart the seam in the back so you won't have to pull them down."“我们必须拆开裤子后面的缝合处，那样你们就不用脱裤子了。”《二战启示录》

这句揭开了柏拉图的狡辩的秘密。通过正义，柏拉图想讨论个人的道德以及整个国家的构架。

但我们不应被骗：事实上，这位大师是用这个论点作为衔接将两本书拼凑起来。