Polymnite
树枝石
🗣️ 情景例句
Claim concerning transportation should be referred to the shiping company.
涉及运输问题，应当向船运公司提出索赔。
May I smoke?
我能抽烟吗？
I'm planning to do a special study of satellites next term.
我计划下学期就卫星的问题做些特别的研究。