Pnpndiode
[电] PNPN(四层)二极管
🗣️ 情景例句
I'm on the top floor.
我在顶层。
Button holes are very hard to sew.
要缝钮扣洞非常难。
Suppose every sensor gives perfectly accurate readings of temperature,
再假定每个传感器都极端准确地读出了温度、