R acid
[化] R酸; 2-萘酚-3,6-二磺酸
🧩 词语组成解析
🗣️ 情景例句
You have thirty seconds to make a word,
你们有三十秒的时间造一个字，
Children quarrels are soon forgotten.
孩子们的吵架很快就会被忘记。
Grandma is ill, she said. I must take her to hospital.
“奶奶病了，”她说，“我必须送她去医院。