Karidium
氟化钠
🗣️ 情景例句
Good day also to you.
再见！
I'm glad to hear about your graduation.
我很高兴得知你毕业了。
One had winter we watched the river creep up the lower meadows.
有一年冬天，天气不好，我们眼看着河水浸没了地势较低的草场。