They grow over time. So, checking the length of the teeth is a way of knowing the horse's age.

马牙会随着时间慢慢生长。所以，察看马牙的长度就成了一种了解马龄的方法。

So this RCM message buffer is the header where it checks this length, for example.

因此，例如，此 RCM 消息缓冲区是检查此长度的标头。