Etydion
乙恶二酮
🗣️ 情景例句
Are you having a good time, Susan?
玩得高兴吗， Susan？
Thank you.
谢谢。
it must be known to any kind of radio astronomer in the universe.
这个频率是宇宙中任何射电天文学家都应该熟悉的。