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
I am so touched. The two of you are really something.
我太感动了。你们俩个真是了不起。
I did it without much difficulty.
我没费多少劲就完成了那项工作。
What about a quarter past two?
2：15怎样！