Central difference operator
[计] 中心差分算子
🧩 词语组成解析
🗣️ 情景例句
You ordered enough for three or four people,but I'm not complaining.
你叫了够三到四个人吃的菜，但我毫不在意。
He doesn't like to talk about political matters.
他不喜欢谈政治的事情。
But people who are cut off not only from foreign tourists, but even from their own countrymen can be hostile to travellers.
但是，那些不但与外国旅游者隔绝，而且与本国同胞隔绝的人们有可能对游客抱有敌意。