Radiocolloid
[化] 放射性胶体
🗣️ 情景例句
Hello, this is ... What can I do for you?
喂， 我是……我能为你做点什么吗？
Let me carry your baggage.
让我拿你的行李。
This product is doing very well in foreign countries.
这种产品在国外很畅销。