Cataloid
胶体二氧化硅
🗣️ 情景例句
Now let's discuss the freight and packing.
现在让我们来讨论一下货运与包装问题。
The chemist is testing enzymes.
化学家在试验着酶。
The man was ordered to pay $3,500 for the cost of the trip.
此人被责令交付旅费3，500英镑，