Sentinel pile
[医] 前哨痔(肛裂下端的痔)
🧩 词语组成解析
sentinel
['sentinl]
n. 岗哨，哨兵;
🗣️ 情景例句
It's cold outside.
外面很冷。
He is in conference.
他正在开会。
What I saw made me very sad.
我所见到的一切使我非常难过。