Radioactive isotope
[机] 放射性同位素
🧩 词语组成解析
🗣️ 情景例句
I'd like to check this book out.
我想借这本书。
We invited two guests to dinner,but they didn't come.
我们邀请了2个客人去吃晚饭，但是他们没来。
In the afternoon, she usually sees her friends.They often drink tea together.
下午，她总是会见她的朋友。她们经常在一起喝茶。