Silfrax
碳化硅高级耐火材料
🗣️ 情景例句
Is this your very first advanced aerobics class?
这是你第一次上有氧运动高级班吗？
How can I get in touch with you?
我怎样能跟你联络上？
Jim ! Jim ! It's time to get up !
吉姆，吉姆，该起床了！