Radioindicator
[化] 放射性指示剂
🗣️ 情景例句
I understood everything the minute I saw her face.
我一看见她的面孔，就明白了一切。
Your friend was here a week ago,wasn't he?
一个星期前，你的朋友曾在这里，是不是？
What should I do? Maybe I should have told that workmate I knew what he was doing.
我该怎么办？也许我早该对那个工人说我知道他的行为。