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If you want to fill a sink or bathtub with water, you need to do one thing first and that's stopper or plug up the drainpipe.
如果你想把水槽或浴缸放滿水，你需要做的第一件事這就是用塞子之類的東西堵住排水管。
Later, when you unplug the stopper, the used water will go rushing out down the drain.
然后，當(dāng)你拔掉塞子之后，用過的水就會漏進下水道里。
Hopefully, nothing valuable (such as a diamond ring) will be in that water, because after the water flows down the drain, it is gone forever.
我們都希望不要有什么貴重的東西（比如鉆戒）掉在水里——因為水流進下水道之后，這些貴重東西永遠也找不回來了。
Anything that was mistakenly dropped into the water will therefore also disappear down the drain, and then it will be very difficult probably impossible to get it back.
任何掉在水里的東西將最終落入下水道里——這將非常困難——恐怕不可能——把它找回來了。
From the sad reality of losing a cherished object down a sink or bathtub drain comes this idiom, meaning to do or attempt to do something that ultimately will be lost forever.
通過這個直觀的解釋，我們理解了這個成語。它的意思是“做或試圖做一些最終將永遠失去的事情”。
It can also mean to put great effort into a wasted activity.
同時，它還含有“將巨大的努力浪費在無用的事情上”的意思。
