Picrofluite
氟镁石
🗣️ 情景例句
What's the tuition for one year of college?
大学一年的学费是多少？
The class made noticeable improvement.
这班有明显的进步。
These are partly a matter of personal circumstances, partly a matter of psychology.
这里一方面是个人所处的环境，另一方面是个心理学的问题。