Kalvar
卡尔瓦尔光致散射体
🗣️ 情景例句
Have you got any plans for celebrating your birthday?
你计划好怎样庆祝你的生日了吗？
We can't decide where to go.
我们不能决定去那里。
What happened before printing was invented?
印刷术发明以前是怎么一回事？