Ddf
[计] 数据库描述文件, 开发论证设施
🗣️ 情景例句
She doesn't have the phone number.
她不知道那儿的电话号码。
He has spent over six years working in Africa and India.
在非洲和印度工作了六年。
I saw it with my own eyes.
我亲眼所见。