Triangular number - 三角形数，怎么读怎么用

🧩 词语组成解析

triangular [traɪ'æŋgjəlɚ]

adj. 三角（形）的;由三个部分构成的;三方面的;

tri 三 + ang=angle角 + ular...的 → 三角形的, 三人间的

number ['nʌmbɚ]

n. 数字;数量;号码;编号; v. 标号;总计;把…算作;

numer, number 表示”数字”;”计算”,”估算”

Did you find the sandwich I made for you?

你找到我为你做的三明治了吗？

I think you probably know China has adopted a flexible policy in her foreign trade.

我想你也许已经了解到中国在对外贸易中采取了灵活的政策。

Three quarters of the world's books and newspapers are written in English.

3/4的书籍和报纸是用英语写的。

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