约 2,770,000 个结果
在新选项卡中打开链接
  1. An Introduction to Sound Waves for Kids

  2. sound - Kids | Britannica Kids | Homework Help

  3. 18 Lessons to Teach the Science of Sound

  4. Sound Waves - Library For Kids

  5. Physics for Kids: Sound - Pitch and Acoustics - Ducksters

  6. Physics for Kids: Basics of Sound - Ducksters

  7. Physics for Kids: Sound Wave Characteristics - Ducksters

  8. 5 Sound Wave Experiments for Kids - Teach Beside Me

  9. Sound facts for kids - Kids encyclopedia

  10. Sound Waves for Kids: Explore Sound & Wave Motion Science!