Backward difference operator
[计] 后向差分算子
🧩 词语组成解析
🗣️ 情景例句
Keep out of what doesn't concern you.
不关你的事不要插手。
Where were you born?
你出生在什么地方？
That's right! A friend gave me a photo. I wanted to show it to you.
对！一位朋友给了我一张照片。我要拿给你看看。