Piperonylic acid
[化] 胡椒基酸; 3,4-亚甲二氧基苯甲酸
🧩 词语组成解析
🗣️ 情景例句
Come on. You all helped.
别这样说。你们都帮了忙。
Where is gate six?
6号登机门在哪儿？
Frank could hardly conceal his excitement, for he knew that he had made a real discovery.
弗兰克几乎无法掩饰自己兴奋的心情，因为他明白自己发现了一件珍品。