So if we had some way to stop this scaling -- and so I picked up some shells on the beach. And I asked them, what is scaling? What's inside your pipes?
所以如果能够阻止水垢沉积... 听完以后我捡起海滩上的一 些贝壳。我问他们， 水垢是什麽？水管里的东西是什么？