Chernikite
钽钨钛钙石
🗣️ 情景例句
Are all the classes within walking distance?
所有的教室都在步行范围之内吗？
I would like to call a gardener to come this afternoon.
我要叫一个园丁今天下午来。
He took off the first shoe and threw it on the floor.
他脱下第一只鞋子，把它丢在地板上。