Vacuum tube detector
[电] 真空管检波器
🧩 词语组成解析
🗣️ 情景例句
No. Instead of exercising, I photographed the class.
没有， 没有， 我在给他们拍照。
My father always gave an ear to my problems.
家父常常倾听我的问题。
I appreciate John's helping in time.
我感谢约翰的及时帮助。