Infrequence
n. 很少发生,罕见
🗣️ 情景例句
I don't know.
我不知道。
Let me tell you the details.
让我告诉你细节。
namely 6 million million miles.) Radio waves also travel at the speed of light,
即6万亿英里）。无线电波也是以光速传播的。