那就说明你会双喜临门呗。

That means you'll have double happiness.

真的？这可是双喜临门了！再次恭喜你。

Really? That's the icing on the cake. Congratulation again!

对51岁的尔森来说，这是一件双喜临门的事。

For Erson, 51, it's a double blessing.

不过，有一些人，尤其是乡下人很有可能请算命先生挑个结婚的吉日(通常是双日子)，这样就是双喜临门了。

However, quite a few others, especially those in the countryside, would probably ask a fortune-teller for a lucky date (usually an even number) so that their marriage would have "Double Happiness".