Radionitrogen
[医] 放射性氮, 射氮
🗣️ 情景例句
when I was about eighteen years old.
那时我差不多十八岁。
The adventure had been planned for quite a while.
那项冒险曾经作了长期的周详计划。
The show is supposed to be good.
这场表演应当是相当好的。