Triangular number
三角形数
🧩 词语组成解析
🗣️ 情景例句
You are one fantastic mom,
是一位好母亲。
Silent men, like still waters, are deep and dangerous.
沈默的人像静水一样，深而难测。
if you think what it must be like to share the deck of a ship with several squadrons of jet aircraft,
因此，如果你能想像出同在一个甲板上是什么滋味儿的话，和几个中队的喷气机。