Sigmoid valves
[医] 半月瓣
🧩 词语组成解析
a. S字形的, 乙状结肠的, C字形的\\nn. 乙状结肠
n. 阀门；真空管；瓣膜（valve的复数）
🗣️ 情景例句
He is as poor as a church mouse.
他一贫如洗。
Sorry, I guess I wasn't thinking. I won't do it again.
对不起。我对这事没想过，下次不这样了。
The temperature drops to -- 30 o and very few people attempt to cross the Pass.
气温下降到零下30度，试图跨越山口的人寥寥无几。