C13
[医] 碳13, 天然同位素碳(原子量13)
🗣️ 情景例句
Medicine should be stored somewhere your kids can't reach it.
药物应摆放在孩子们够不着的地方。
I'm studying upstairs.
我在楼上读书。
Suddenly someone shouted.'It's two minutes past twelve! The clock has stopped!'
“已经12点零2分了！那钟已经停了！”