D-usnic acid
[化] 右旋地衣酸
🧩 词语组成解析
🗣️ 情景例句
It's no use crying over spilt milk. What's done cannot be undone.
覆水难收。
You can't make omelets (or omeletts) without breaking eggs.
有失才有得。
In the nineteenth century, a novelist would bring his story to a conclusion by presenting his readers with a series of coincidences -- most of them wildly improbable.
在19世纪，小说家常在小说结尾处给读者准备一系列的巧合——大部分是牵强附会，极不可能的。