D-usninic acid
[化] 右旋地衣酸
🧩 词语组成解析
🗣️ 情景例句
It's no big deal.
这没有什么。
A man may love his house well without riding on the ridge.
有宝何必人前夸。
Alfred had learned many of their ballads in his youth,
阿尔弗德年轻时学过许多民歌，