Kalkowskite
高铁钛铁矿, 铈钇钛铁矿
🗣️ 情景例句
I've been trying to find
我一直在寻求
After my core courses are finished, I'll be doing independent study.
在完成基础课程之后，我将作独立的研究。
Mary is still writing letters. She's been writing letters all day.
马力还在写信，她写了一整天的信。