Pretersonics
[电] 高于500百万赫频率的声纳波
🗣️ 情景例句
Will I have to wait for a long time?
我得等很久吗？
Do you have an opinion?
你有意见吗？
(A light year is the distance which light travels at 186,000 miles per second in one year,
一光年是光以每秒186，000英里的速度在一年内走的距离，