perforated iron cathode
基本释义
多孔铁阴极
实用场景例句
校园生活
She plays the piano very well in our school band.
她在我们学校的乐队里钢琴弹得很好。
The piano in the music room is very old.
音乐室里的钢琴非常旧。
I want to learn how to play the piano.
我想学弹钢琴。
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