Hexadienic acid
[化] 己二烯酸
🧩 词语组成解析
🗣️ 情景例句
Yes. About four years ago.
是的 ，大约四年前走的。
Where is immigration?
入境处在什么地方？
It was from the study of these that so much was learnt about the interior of the earth.
正是从这两种波的研究中，我们可以了解到地球内部的许多情况。