Embryonic sac
[医] 胚囊
🧩 词语组成解析
sac
[sæk]
n. （动植物组织中的）囊，液囊;
abbr. 缩写 = (US) Strategic Air Command 战略空军司令部。;
🗣️ 情景例句
Are you having a good time, Susan?
玩得高兴吗， Susan？
My phone was out of order.
我的电话坏了。
I haven't met him yet.
我还没见过他。