Ibi
[医][=inter-beat intervals]心搏间期
🗣️ 情景例句
I would like to send this by registered mail, please.
我想把这封信挂号寄出。
You're a very beautiful woman. You should try this one. I'm sure you'll be more beautiful than ever.
你是位美人儿。且试一试这个，肯定会让你变得更美丽的。
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。