Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版:英文原文完整保留,中文紧随对应单元;术语采用 v20260916 确认表,自动语义审校结果可追溯。
Speed of sound
声速
Wave relationship
波的关系
Ultrasound
超声波
Infrasound
次声波
Index

Sound References
索引声音参考
 
HyperPhysics                      R Nave
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