Common difference
公差
🧩 词语组成解析
common
['kɑmən]
adj. 普通的;通俗的;[数学]公共的;共有的;
n. [法律]（对土地、水域的）共有权;公共用地;普通;平民;
🗣️ 情景例句
Then an adult must sign for you.
那就必须有一位成年人来替你签字。
To chase the thief
追踪小偷
He said he was educated in the United States.
他说他是在美国受的教育。