51.However, if there is more activity in small nerve fibers, then there will be pain. Here is what the gate control theory looks like.

然而，如果小神经纤维更活跃，就会有疼痛。这就是门控理论。

Again, it's not clear what's special about this point, but this trick seems to take advantage of something called the gate control theory of pain.

同样，不清楚这一点有什么特别之处，但这个技巧似乎利用了一种叫做疼痛门控理论的东西。