Difference equation
[计] 差分方程
🧩 词语组成解析
🗣️ 情景例句
The number's no longer in service.
这个号码现在是空号。
It is better to be alone than in bad company.
无友要比交坏友好。
'Certainly,' the girl said.
“当然可以，”那姑娘说。