Boundary operator
[计] 边缘算子
🧩 词语组成解析
🗣️ 情景例句
of forty-three years of on-the-job training.
关于我四十三年的工作经历。
I must know your opinion.Do you agree with me?
我必须知道你的意见.你同意我吗？
But we won't have our big family get-together until Christmas.
但我们要等到圣诞节才会有家庭大团圆。