Fisser
可裂变物质
🗣️ 情景例句
Bye.
再见。
She sent me a Christmas card last year.
去年寄过一张圣诞卡。
The family lived in Aberdeen, a small town of 23,000 inhabitants in South Dakota.
这户人家住在南达科他州一个人口为23，000 的小镇上，镇名为阿拜丁。