Boundary operator
[计] 边缘算子
🧩 词语组成解析
🗣️ 情景例句
This has been a hard course for me.
这门课对于我来说很难。
How's your daughter?
你的儿子好吗？
Then he smiled and told me I would receive an extra thousand pounds a year!
然后他微笑了一下告诉我说，我每年将得到1，000 英镑的额外收入。