Cathetron
[电]外控式三极汞气整流管
🗣️ 情景例句
I am sure. So, we'll be expecting the first shipment in less than a month.
那当然。我们都希望第一批货在一个月之内可以装船。
In elementary school,the child learns to read and write.
在小学，孩子学习读写。
No, she bought them in the U.S.
不。她是在美国买的。