Radiotron
真空管, 三极电子管
🗣️ 情景例句
I'm sure they'll like it.
我相信他们会喜欢的。
I'm afraid you will miss your train.
我怕你会错过火车。
If the feeding place was away from the sun, the straight part of the wagging dance pointed downward.
如果喂食地点向着太阳，跳舞的蜜蜂在跳摇摆舞时直线部分就一直向上。