Arithmetical series
[机] 等差级数
🧩 词语组成解析
a. 算术的, 算术上的\\n[机] 算术的
🗣️ 情景例句
and he's very unhappy about not working.
他对没有工作感到怏怏不乐。
Does the back door have a lock on it?
后门上有锁吗？
Yes, that's right.
你说对啦。