Constant area
[计] 常数区
🧩 词语组成解析
area
['ɛrɪə]
n. 地区;区域，范围;面积，平地;领域;
🗣️ 情景例句
A credit card is very useful when you go traveling.
当然旅游的时候，信用卡很有用。
My father always gave an ear to my problems.
家父常常倾听我的问题。
Not only did I know her, but I was her best friend.
我不仅认识她，还是她最好的朋友。