Calsil
硅酸钙盐
🗣️ 情景例句
I don't know how to solve the problem. Will you help me out?
我不知道该怎么解决这个问题。你能帮我吗？
An empty purse frightens many friends.
曩中无分文，亲友不上门。
' Just then, the telephone rang.
”正在这时，电话铃响了。