Vitelline sac
[医] 卵黄囊
🧩 词语组成解析
a. 卵黄的\\n[医] 卵黄的
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
Well, how's everything here?
唔，东西都收拾好了吗？
You could say that too.
也可以这么说啦！
With the invention of writing, a great advance was made, for knowledge could then be not only communicated but also stored.
随着书写的发明，又迈进了一大步，因为这样一来，知识不仅能交流，而且能储存了。