Radioactive isotope
[机] 放射性同位素
🧩 词语组成解析
🗣️ 情景例句
What number are you trying to dial?
你要的电话是什么号码？
I often have supper at night.
我常常在晚上吃晚餐。
That's a nice car. How long have you had it?
好漂亮的汽车。你买多久了？