Preformation membranes
[医] 预成膜
🧩 词语组成解析
n. 预先形成\\n[医] 先成说, 预成说
n. （动物或植物体内的）薄膜( membrane的复数形式 ); 隔膜; （可起防水、防风等作用的）膜状物
🗣️ 情景例句
you had some doubts about wanting to go to Michigan.
你对上Michigan大学有些疑虑。
John always takes pleasure in leaving the city for a while.
约翰常常以溜出城镇一会儿为乐。
As far as policy is concerned, I have to say something.
谈到政策，我得说几句。