Harmodotron
(产生毫米波的)电子束管, (正交场)毫米波振荡管
🗣️ 情景例句
She forgave her husband.
她原谅了她的丈夫。
It is too late to cast anchor when the ship is on the rock.
船触礁后在抛锚，为时已经太晚了。
Betty and Susan are talking on the telephone.
贝蒂和苏珊正在通电话。