Photovalve
光电发射管, 光发射元件
🗣️ 情景例句
I'm willing to make decisions.
能当机立断。
Please call me if you have any problems.
如果你有难题，就请打电话给我吧。
My father was shocked.Now we are not allowed to touch it.
我父亲大为吃惊，不许我们再动它。