Boronatrocalcite
硼钠钙石
🗣️ 情景例句
Hello, who's speaking, please?
喂， 谁在讲话？
have you invited any friends?
你邀请朋友吗？
We could have a walk around. Let's go out at about six o'clock, shall we?
我们可以四处走走。咱们大约6点出发，行吗？