indicate the sound and meaning 中的 meaning 前面应该再加上个 the.
要不就sound 和meaning 前面都不加不定冠词 the ,不定冠词指的是 特指某一类,在这里表达宽泛的声音和意义 可以不用.
另外,这个句式很chinglish.更纯正一些的表达应该是：There about five thousands commonly used words indicating the sound and meaning at the same time in Chinese language,a great remakable part of Chinese culture .