Trifluoride
三氟化物
🗣️ 情景例句
What's the nature of the problem?
是什么样的问题？
She is singing in practice.
她在练习唱歌。
This is a kind of printing that blind people can read by touching groups of raised points that are printed on paper.
布莱叶盲文是一种印刷字体，盲人通过摸印在纸上起的点点来读书。