Allantoic sac
[医] 尿膜囊
🧩 词语组成解析
a. [动]尿囊的,尿囊内的,有尿囊的
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
We'll go together.
我们一起去。
Which train do I take to Philadelphia?
去费城乘哪趟车？
The editor at once sent the journalist a fax instructing him find out the exact number of steps and the height of the wall.
”编辑立即给那位记者发去传真，要求他核实一下台阶的确切数字和围墙的高度。