Radiotron
真空管, 三极电子管
🗣️ 情景例句
I don't know.
我不知道。
What platform does the train leave from?
这班车从哪个站台开出呢？
and often are foolish enough to let the adolescents see that they are annoyed.
而且愚蠢地让孩子看出自己的烦恼。