Precardinal veins
[医] 前主静脉(胚)
🧩 词语组成解析
[医] 前主静脉的(胚)
n. 纹理；静脉（vein的复数）
🗣️ 情景例句
Being a mother is not easy,
当一个母亲真不容易，
He that would have eggs must endure the cackling of hens.
欲图逸，得先劳。
No, he doesn't.
不，他不发烧了。