Ddf
[计] 数据库描述文件, 开发论证设施
🗣️ 情景例句
I'm working on-it.
我正在做这项工作。
More of our worries come from within than from without.
烦恼发乎内者多于发乎外。
At that moment Lucy came into the library.
正在那时候，露茜走进图书馆。