Radioactive isotope
[机] 放射性同位素
🧩 词语组成解析
🗣️ 情景例句
No. I really don't know how to go about it.
没有。我真不知道如何填。
Why did you get home so late?
为什么你这么晚回家？
Fifteen policemen had to push very hard to get him off the main street.
15个警察不得不用很大的力气把它推离主要街道。