科学家观察到三种新粒子 更好地理解夸克如何“成群结队”形成复合粒子
2022-07-08 17:18:43
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1、操场的英文：playground，英 [ˈpleɪɡraʊnd] 美 [ˈpleɪɡraʊnd]。
2、姑娘们在操场上跳绳。The girls were skipping in the playground.
3、在同一时期的威尔士，男孩们在操场上讲威尔士语是要吃鞭子的。In Wales in the same era, boys were caned for speaking Welsh in the playground.