Triangular number
三角形数
🧩 词语组成解析
🗣️ 情景例句
I know you want to get to it.
我知道你想要开始啦。
I've spoken English all my life.
我一辈子说英语。
After a little time, she chose one of the most expensive dresses in the shop and handed it to an assistant who wrapped it up for her as quickly as possible.
过了一会儿，她又选了商场里最昂贵的一件衣服，把它递给了售货员。那售货员以最快的速度为她包好了衣服。