Arithmetical progression
[经] 算术级数, 等差级数
🧩 词语组成解析
a. 算术的, 算术上的\\n[机] 算术的
progression
[prə'ɡrɛʃən]
n. （事件的）连续;一系列;发展，进展;<数>级数;
🗣️ 情景例句
Are you ready for this?
想听着。
I dropped the letter in the mailbox on the corner.
我把信放到角落上的邮箱里。
Eric had been the eldest son of the family, very much older than his two brothers.
埃里克是这家长子。