This is a slightly extreme case in point but it helps illustrate the logistical challenges, in particular in resource-poor settings, of what's required to get vaccines refrigerated and maintain the cold chain.
这是一个有点极端的例子， 但是它能帮助解释 尤其是在资源贫乏的环境中， 使疫苗持续保持在低温状态 所面临的物流方面的挑战。