Difference operator
[计] 差分算子
🧩 词语组成解析
🗣️ 情景例句
Whose woods these are I think I know.
这是谁的林子， 我想我知道。
Beware of him who regards not his reputation.
要谨防不重自己名誉的人。
There is a new type of machine which can produce colour copies.
有一种新型的机器能够制作出彩色复印件。