Clapotement
[医] 振荡音
🗣️ 情景例句
Can you weigh this for me?
你能帮我称称这（包裹）吗？
Don't be afraid he will get there on time.
不要怕他会准时到那里。
This depends on the precise radio frequency of the 21-cm wavelength, or 1420 megacycles per second.
这种通讯联系要靠21厘米波段，即每秒1420兆周的精确无线电频率。