Looks like that marriage went down the drain.

看来这人的婚姻是泡汤了。

Okay. And that went down the drain.

好吧 这下穿越进下水道了。

Oh, you know I lent this to Martha three months ago and she said that it went down the drain.

三个月前我借给了Martha，她说被冲到下水道去了。

And she said that it went down the drain.

她说掉进下水道里了。

All you can say: " All my work went down the drain. It was wasted. It's lost forever. I can't get it back." Okay?

你只能说：“我所有的工作都付诸东流了。它被浪费了。它永远丢失了。我无法找回它。”好的？

If we look at the sentence which says: " All my money went down the drain." If you understand the word, " drain" , you can probably understand this sentence and the meaning of this idiom.

如果我们看一下这句话：“我所有的钱都花光了。”如果你了解“漏”这个词，你大概就能理解这句话和这个成语的意思。