No wonder that people are more tired and are not interested in reading books as much as in the past.

no 表示否定，意思是"不"或"没有"。 wonder 作为名词时意思是"惊奇、奇迹"，作为动词时意思是"想知道、感到惊奇"。 no wonder 是一个固定短语，表示"难怪、不足为奇"，用来表达对某种情况不感到惊讶。