Backward difference operator
[计] 后向差分算子
🧩 词语组成解析
🗣️ 情景例句
I'm the vice-president of new toy development.
我是负责新玩具开发的副总裁。
None are so deaf as those who will not hear.
不愿倾听意见者最聋。
It says here,on this card, that it was used in plays, said Meimei. it's a king's hat!
“这儿，这张卡片上说那是演戏用的，”梅梅说，“是国王的帽子！”