Uranocene
双环辛四烯合铀
🗣️ 情景例句
a portrait of the United States--
一幅美国的剪影--
The doctor advised me to get plenty of exercise.
医生建议我多锻练。
No one noticed the boy as he crept off.
当男孩从船里爬出来时，谁也没有发现他。