Charmonium
[单复同]n.[核](被认为由一对粲夸克-反夸克构成的)粲素
🗣️ 情景例句
Good day.
再见！
Please use normal export containers unless you receive special instructions from our agents.
除非你们收到我方代理的特别指示，否则请用正常出口集装箱。
That's a good idea.
那真是好主意。