Ad grat. acid.
[医] 至适宜酸度
🧩 词语组成解析
ad
[æd]
n. 广告;网球中的优势分advantage. ad in;
🗣️ 情景例句
Let me help.
我来帮忙。
It's been a bad day.
今天糟透了。
Forty-two years later a tunnel was actually begun.
42年以后，隧道实际已经开始建了。