In order to understand head butting, we need to know how much force is involved in impact.

为了理解用头撞，我们需要知道撞击中涉及的力有多大。

Here are some questions that need to be answered before we can entertain the possibility that Pachycephalosaurs engaged in musk oxen style head butting.

在我们接受厚头龙类进行麝牛式头部撞击的可能性之前，需要回答以下一些问题。