Space: Location and Movement/() -> #2of3 Intermediate/(中级) -> Properties of Sounds/(声音的属性) -> Learn/(学习)

Space: Location and Movement/() -> Capturing and Reproducing Sounds/(捕捉与重现声音) -> Theory/(理论) -> Step 1 Middle School/(第一步初中) -> Years Group/(年级群)

Space: Location and Movement/() -> The Science of Sounds/(声音的科学) -> #2of3 Intermediate/(中级) -> #[Tier 6] Pedagogical Aspects for Children/([第六]教育层为儿童) -> Users Group/(用户群)