51．What they do is look at familiar conditions from a perspective thatmakes these conditions seem foolish，harmful or affected．

(what引导主语从句；that引导定语从句)

它们所做的就是从这样一个角度来看待熟悉的环境，使这些环境看上去愚蠢、有害或做作。

分句1：what…

分句2:is

分句3：that makes

1和2嵌套

2和3嵌套