fig-leaf
n leaf of a fig-tree, traditionally used for covering the genital organs of nude bodies in drawings, statues, etc 无花果树叶(传统上用作裸体画像、 雕像等的阴部覆盖物).
Next, if it is not a story, get an idea of the organization of the book. Read the back cover and the introduction. Look at the pictures and the short texts below them. Turn to the front of the book and look at the contents. This way you can decide whether