Hexamethyleneamine
己烯胺
🗣️ 情景例句
It's almost ten o'clock.
现在已经快十点钟了。
I enclosed some photographs in my letter.
我在信封里装了一些相片。
We'll have to buy some more bricks. I don't think these will be enough.
我们需要买更多的砖。我认为这些不够。