Difference operator
[计] 差分算子
🧩 词语组成解析
🗣️ 情景例句
He is tough to work with.
他很难共事。
There is a black sheep in every flock.
群群羊中有黑羊。
He noticed the remains of a snake which was wound round the electric wires of a 16,000-volt power line.
他发现了缠绕在16，000伏高压线上的一条死蛇。