从前，有一个名叫麦克的铁匠。
他家有一条狗，叫做鲁比。
每当麦克在打铁时，鲁比就会在一旁安静地睡觉。
然而，当麦克开始吃饭时，鲁比会立刻跑到他的身边，摇摇尾巴，好像在说：“主人，我也饿了。”
有一天，麦克看着正在吃饭的鲁比，心里想：“这小家伙真是奇怪。为什么我在用力敲打铁的时候，它能睡得那么香甜，而我只要轻轻一动筷子，它就立刻醒过来呢？”
于是，麦克扔给鲁比一块骨头，对它说：“你这个贪睡的小家伙，为什么那响亮的打铁声没有把你吵醒，而我们吃饭的声音却让你这么敏感呢？”
这个故事告诉我们一个道理，有些人只关心自己能得到什么好处。
对于他们来说，只有有利可图的事情才会引起他们的注意，而对于那些对自己无利可图的事情，他们则会置之不理。
这就像是鲁比一样，只有当有食物可以吃的时候，它才会醒过来，而打铁的声音再大，也不能把它吵醒。
Once upon a time, there was a blacksmith named Mike.
He had a dog at home, called Ruby.
Whenever Mike was forging iron, Ruby would sleep quietly beside him.
However, when Mike started eating, Ruby would run to his side immediately, wagging her tail as if saying, "Master, I'm hungry too."
One day, Mike looked at Ruby who was eating and thought to himself, "This little fellow is strange. Why can it sleep so soundly when I'm hammering iron, but wakes up instantly as soon as I move my chopsticks?"
So, Mike threw a bone to Ruby and said to her, "You little sleepyhead, why didn't the loud noise of forging wake you up, but our eating sounds make you so sensitive?"
This story teaches us a lesson: Some people only care about what benefits they can get.
For them, only profitable things will catch their attention, while they will ignore those things that are not beneficial to them.
It's just like Ruby, who only wakes up when there's food to eat, and no matter how loud the forging sound is, it won't wake her up.
