Sentence:  As such , one cannot fully understand the thought of the pre-Han and Han periods without knowing the meanings inherent in the Lo Shu ; but , conversely , one cannot begin to understand the Lo Shu without knowing something about the world view of the Old Chinese , which they felt they saw <WSD>expressed</WSD> in it . 
Meaning of the word marked with <WSD> tags:  serve as a means for expressing something