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
Have you ever been to Nanjing?
你曾去过南京吗？
My money is all gone!
我一文不名了！
for she had sixteen watertight compartments.
因为船由16个密封舱组成，