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
He did everything within his power to achieve the goal.
他竭尽全力去实现目标。
A smooth sea never made a skillful mariner.
平静的海洋练不出熟练的水手。
I am very well. Did you have a good summer holiday?
我很好。你暑假过得好吗？