Feldspatite
長石巖類
??? 情景例句
With your background and experience,
依你的背景和經驗，
What's your nationality? Are you an American.
你的國籍是什么？你是美國人？
By the way, before leaving this subject, I would like to add a few comments.
在結束這個問題之前順便一提，我希望能再提出一些看法。