B. u.
[医] 棱底向上
🧩 词语组成解析
[医] 单位
🗣️ 情景例句
If you would supervise the refurbishing,
假如你能监督整修过程，
Sorry to keep you waiting.
抱歉让你久等了。
After lunch Aunt Huang came in and she looked worried.
午饭后黄阿姨来了，她面带愁容。