Pentacarboxylic acid
[化] 五羧酸
🧩 词语组成解析
🗣️ 情景例句
No ... OK ...
不是……好……
The old lady takes delight in visits from her grandchildren.
那个老妇人以孙辈门看她来为乐。
One moring she was working at her desk in the library when a boy came in.
一天早上，她正在图书馆里伏案工作，这时，一个男孩走进来。