Pionium
n. [核]π介子素(由一个π介子和一个μ子组成的短命的准原子)
🗣️ 情景例句
I'm calling to ask you some questions about Susan.
我打电话是想问一些关于苏珊的事。
It's incredible.
令人难以置信。
Just as Mrs.Richards was entering the dinning room, there was a knock on the front door.
理查兹夫人刚刚走进餐厅，前门就传来敲门声。