Despite their different plots, the two novels share a superficial resemblance in their cover designs.

superficial 由前缀 super-（表示"在...之上"）和词根 fic（来自拉丁语 facies，意为"表面"）组成，加上形容词后缀 -ial 构成。字面意思是"在表面上的"，引申为"表面的、肤浅的"。