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
And have a nice afternoon.
祝下午玩得愉快。
Do you know the exact date?
你知道确切日期吗？
One day, the man downstairs went to talk to the man. He went upstairs and knocked the door.
一天，楼下人去找楼上人谈谈。 他上楼敲门。