Quadratron
热阴极四极管
🗣️ 情景例句
He is a good speaker of English.
他英语说得非常流利。
You cannot make a silk purse out of a sow's ear.
猪耳朵做不成丝钱包；巧妇难为无米之炊。
I'm fine,too. Excuse me, Miss Gao, what's this in English?
我也很好。请问，高小姐，这个用英语怎么说？