D-usnic acid
[化] 右旋地衣酸
🧩 词语组成解析
🗣️ 情景例句
Hi, Tom. How are you doing?
喂，汤姆。你好吗？
It is easier to raise the devil than to lay him.
养虎易，驯虎难。
I can hear something! said Lucy.Does anybody live on this island?
“我听到什么东西了！”露茜说，“岛上有人居住吗？”