Strata externum
[医] 外层
🧩 词语组成解析
strata
['streitə]
n. 地层;岩层( stratum的名词复数 );地层;社会阶层;
🗣️ 情景例句
Hello. Is Susan there?
喂，是苏珊吗？
Money spent on the brain is never spent in vain.
智力投资，决非虚掷。
It was spring,but the weather was awful.It rained all the time.
是春天，但天气太糟了。一直在下雨。