Ectosac
[医] 外膜, 外囊(卵)
🗣️ 情景例句
It's good to meet you.
很高兴见到 。
We've got to get a sofa and a chair for the living room.
我们必须有一张沙发和椅子放在客厅。
No,you mustn't eat anything until you see the doctor.
不行，看医生之前你不可以吃任何东西。