Radiospectrography
无线电频谱学
🗣️ 情景例句
Isn't this the Nanjing University?
请问是南京大学吗？
There'll be time for questions at the end.
最后会有时间发问的。
I know! smiled Lucy. They have steps, and they begin with L!
“我知道！”露茜笑着说，“它们有阶梯，并且这个单词是以L开头的！”