D-usnic acid
[化] 右旋地衣酸
🧩 词语组成解析
🗣️ 情景例句
Will you be so kind as to help me out of the difficulty?
帮助我克服困难，好吗？
He is a fool who cannot be angry,but he is a wise man who will not.
不会发怒是蠢人，不愿发怒是聪明人。
Did you give our English teacher a card for Teachers' Day?
你给了我们的英语老师教师节贺卡了吗？