Cavum medullare ossium
[医] 骨髓腔
🧩 词语组成解析
n. 空腔(如耳腔)
🗣️ 情景例句
That's what I came to ask you to do, Malcolm.
这正是我来请你做的， Malcolm。
I didn't know whether to send the letter airmail or not.
我不知道是否送航空邮件。
Only by working hard can we succeed in doing everything.
只有努力，才能成功