Walkerite
镁针钠钙石
🗣️ 情景例句
It's a problem, isn't it?
这确实是个问题，不是吗？
What time is it?
几点钟了？
We still think it a miracle that they we able to do so.
他们终于成功了。至今我们仍认为这是个奇迹。