Refrax
金刚砂砖, 碳化硅耐火材料
🗣️ 情景例句
I've been busy all day.
我今天一整天都非常忙。
These shoes are worn-out.They've lasted a long time.
这些鞋子旧了。已经用了很长时间了。
We were getting very worried.
我们都非常担心呢。