"馬車の中で一番悪い車輪が一番大きな音を立てる"

Simplified Meaning:

When there's a problem or weakness in a group or situation, it's often the most obvious and loudest thing that gets noticed first. Imagine pushing a cart with four wheels. If one wheel is broken or squeaky, it will make a lot of noise and grab your attention. This is similar to situations in life where a person who is struggling or causing trouble often stands out more than others who are quietly doing their job. Think about a school classroom. There may be one student who constantly disrupts the class by talking loudly or not following rules. This student gets a lot of attention from the teacher. Meanwhile, the other students who are behaving well might not get as much attention because they aren't causing any problems. In everyday life, this idea can remind us to look deeper into situations. Just because someone or something is making the most noise, it doesn't mean they are the most important. It might just mean they need more help or fixing. When you hear someone complaining a lot or being very loud about an issue, consider if they need some assistance to get things back on track.