Eustasy
海面进退; 海面升降; 冰河变异
🗣️ 情景例句
They do.
是的。
He's tired because he worked hard all day today.
他疲倦是因为他今天整天努力工作。
Excuse me. May I have a piece of paper, please?
请问，我可以要一张纸吗？