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
By plane?
坐飞机来？
It's essential.
这是必要的。
We had lost the path and had no hope of finding it again.
我们找不到那条小路，而且也没有希望再找到它了。