请问这个七边的多角形有多少条对角线？

How many diagonals does this seven-sided polygon have?

youdao

如果有人在七年前告诉我，也就是在我攻读商业与经济学学位的最后一年，我以后会过着没有钱的生活，边看电视边吃晚餐的我听了这话非得噎着。

If someone had told me seven years ago, in my final year of a business and economics degree, that I'd now be living without money, I'd have probably choked on my TV dinner.

youdao

在一边是一个有七条分支的灯柱或是烛台。

And then on one side a seven-branched lampstand or menorah.

youdao