Eustatism
海面升降性, 海面进退性
🗣️ 情景例句
Richard, did you go to the Davis Aerobics class today? Richard
你去上Davis有氧运动健身课了吗？
Sometimes the snow was so deep we could tunnel through it.
偶尔雪会积到可以造隧道那般的深度。
Spiders are busy for at least half the year in killing insects.
蜘蛛至少有半年在忙于吃昆虫。