Dural sac
[医] 硬脊膜囊
🧩 词语组成解析
a. 硬脑膜的\\n[医] 硬脑[脊]膜的
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
I'm afraid I'll be tied up tomorrow at ten.
恐怕明天上午10点我很忙。
I'll be back in 5 days.
我五天之后回来。
I have just received a letter from my old school, informing me that my former headmaster,
我刚刚收到母校的一封信，通知我说以前的校长