Stratas
(strata 的复数) pl. 层, 地层, 阶层\\n[医] 层
🗣️ 情景例句
Exploring outer space is a challenge to mankind.
探索外层空间是一项向人类发出的挑战。
What column do you like best?
你最喜欢哪个栏目？
Yu Yan and Jim were neck and neck. They both passed on their sticks at the same time.
余延和吉姆跑得一样快。