Chevkinite
硅钛酸铈钇矿
🗣️ 情景例句
Davis Aerobics Center for Good Health.
Davis有氧运动健身中心。
What's your trouble?
你有什么不舒服？
He found it very difficult to get to sleep and he was rather angry with the man upstairs.
他觉得这样很难入睡， 他对楼上的人相当生气。