Oehl's strata
[醫] 透明層
?? 詞語組成解析
strata
['streit?]
n. 地層;巖層( stratum的名詞復數 );地層;社會階層;
??? 情景例句
The Post Office aims to improve its quality of service.
郵局銳意改善服務質量。
You have to be there half an hour before departure time.
你要在起飛前半小時到那里。
Mary is still writing letters. She's been writing letters all day.
馬力還在寫信，她寫了一整天的信。