Quadratic sum
[计] 平方和
🧩 词语组成解析
a. 二次的\\nn. 二次方程式
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
He takes things too seriously.
他看待事情太认真了。
That was a close call.
太危险了。
but where had it come from?
但它是从哪儿来的呢？