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
There's a long way to go in reviving the countr's economy.
这个国家的经济复苏还有很长一段路要走。
I haven't seen you for age. You haven't been sick, have you?
好久不见。你不是病了吧？
A sound made by tapping on the hull of a ship will be reflected from the sea bottom,
敲打船体所发了的声音会从海底传回来，