Radioactive isotope
[机] 放射性同位素
🧩 词语组成解析
🗣️ 情景例句
We used to catch crabs.
我们以前常捉螃蟹。
Oh, it's a shame that you have to leave.
哦，真遗憾，你非走不可呀。
Could I have those two tickets, please?
这两张票给我行不行？