常見(jiàn)例句用作名詞 (n.)Cassiterite has been an important tin ore for eons and is still the greatest source of tin today.錫石作爲(wèi)一種重要的錫鑛石已有數(shù)十億年的歷史，時(shí)至今日仍然是錫的重要來(lái)源。 返回 cassiterite