Barratron
非稳定波型磁控管(用以产生噪音干扰)
🗣️ 情景例句
He is still unable to express himself in English.
他仍然不能用英语表达自己的意思。
A man is as old as he feels.
老不老，自己晓。
She likes the children to read newspapers and books in the reading room.
她喜欢孩子们来阅览室读书看报。