Plitron
[电] 高度真空管
🗣️ 情景例句
I beg your pardon.
对不起。
That was a close call.
太危险了。
I'm afraid that he'll forget it if he misses so many lessons. He may even fail his Chinese exam.
如果他再缺这么多课，恐怕他会忘记很多的。他的汉语考试甚至会不及格。