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
But you had to be good at math.
但是你数学一定很好。
He that knows nothing,doubts nothing.
无知即无疑。
You may have heard of Birth Control.
你们也许听说过控制人口出生的措施。