Ectosac
[醫(yī)] 外膜, 外囊(卵)
??? 情景例句
without studying these building plans more carefully.
在沒有仔細研究這些建筑圖的情況下。
Make up your mind!
干脆點！
The airport was built years ago, but for some reason it could not be used then.
機場是許多年前建的，但由于某種原因當(dāng)時未能啟用。