Pyromellitice acid
[建] 苯四甲酸
🧩 词语组成解析
🗣️ 情景例句
I haven't seen you for a long time.
很久没见了。
His failure was a lesson to us.
他的失败是我们的一个教训。
Oh! It looks much better now.
噢！现在似乎好看多了。