Reflectometer
[电] 反射计
🗣️ 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？
I'm sorry. I was just playing football with my friends.
对不起，我只是和朋友去踢了足球。
It is one of the world's most important languages because it is so widely used.
英语使用得如此广泛，它已成为全球最重要的语言之一。