Cassiterite
n. 锡石\\n[化] 锡石
✅ 同义词
🗣️ 情景例句
in the public school
在公立学校中
The homework took me a whole day.
做家庭作业花了我一整天的时间。
That's OK.We really need the material.
没关系，我们急着要这些原料。