Once the brain figures out what kind of injury it is, it'll send a message back to the spot that's in pain.

一旦大脑弄清楚这是什么样的伤害，它就会将信息发送回疼痛的部位。

Perhaps it could respond to touch and feel something hot or sharp, sending a message back up to our brains, just like it does in our body.

也许它可以对触摸和感觉到热或尖锐的东西做出反应，将信息发送回我们的大脑， 就像它在我们身体中所做的那样。

Like, does the app work in the more rural parts of Africa, Asia and elsewhere, or will it work for a refugee on a boat sending a message back home to their family?

比如，该应用程序是否适用于非洲、亚洲和其他地方的农村地区，或者是否适用于船上的难民向家人发送信息？

Of course, " to reply" is to send a message back to that person, or " to forward them" would be to send it to a third person, another person.

当然，“回复” 是将消息发回给那个人，或者“转发” 是将消息发送给第三者， 另一个人。