They can tell you if something is moving but they don't necessarily know if it's a human being or if it's your kids — they don't know the difference, so they will warn you all the time.

它们可以告诉你是否有东西在移动，但不能肯定那是不是一个人，或者是不是你的孩子——它们看不出区别，所以会一直警告你。