Partial sum
[计] 部分和数
🧩 词语组成解析
sum
[sʌm]
n. 总数;算术;金额;概略，要点;
vt.& vi. 总计;总结，概括;归纳;
🗣️ 情景例句
Years of work went into these pictures.
多年心血换来这些照片。
To put on make-up
打扮
They celebrated his birthday with a dance party.
也们举办舞会来祝贺他的生日。