Polyvinylene
聚乙烯撑, 聚次亚乙烯
🗣️ 情景例句
Next weekend ...
下周末……
During your first year of college,did you make straight A's?
在你大学的第一年期间，你一直的得A？
gravity is the force that drives them in a continual attempt to restore the ocean surface to a flat plain.
地球引力是持续不断企图使海面复原为平面的力量。