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
Uh-uh.
嗯。
We have a lot of invitation cards, but they are all for the same date.
我们接到了许多请帖，但是上面的日期却全都是同一天。
Justice had been done even before the man was handed over to the police.
甚至在那人还没被送交给警察之前，正义就已得到了伸张。