The original words are: "A broken car has a spare tire, and idle people can raise fish." This is an online proverb. It means that only a broken car is necessary to keep a spare tire just in case. Only people who are very idle will go to fish farming (fish farming refers to many objects).
Contrary to what is said on the Internet, "good car" corresponds to "broken car" and "busy person" corresponds to "idle person". Does it mean that a good car needs a spare tire? People with true feelings are busy. Do you have time to raise fish?