Pretersonics
[电] 高于500百万赫频率的声纳波
🗣️ 情景例句
The other half?
另一半？
What does you want to buy?
你要买什么？
Fred Pearson was walking through the university town of Oxford one morning in 1961.
1961年的某个早上，弗雷德·皮尔逊正步行通过牛津大学城。