D-usnic acid
[化] 右旋地衣酸
🧩 词语组成解析
🗣️ 情景例句
Did you pay for that?
你付钱了没有？
For how long?
要借多久？
When there is no one in the office, you can leave the answering machine on so that people who call you up can leave a message.
当无人在办公室时，你可以打开留言机，这样打电话给你的人就可以留言了。