Rr
abbr. 无线电航向信标（Radio Range-beacon）；雷达测距（Radar Ranging）；无线电接受器（Radio Receptor）；连流继电器（Reverse Relay）；阻力比（Resistance Ratio）
🗣️ 情景例句
We're out of toilet paper again. Let's buy some more rolls.
咱们又没卫生纸了。再多买几卷吧。
They won't listen, so don't waste your breath telling them.
他们听不进去，不必和他们多费口舌了。
He is swimming across the river.
他正横渡小河。