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我只是想纠正一个thing that was mentioned in this episode. Fire resistance (not fire proofing) does not give you a particular amount of time in a fire. The time refers to the standard fire test, which is quite different to a real fire. The fact the one of the twin towers collapsed after about one hour is a coincidence (and the other tower lasted nearly 2 hours, not to mention building 7 which lasted nearly 7 hours). This is important, as a particularly severe fire can overcome the fire resistance in less time that the rating, so you cannot rely on having an hour in a fire. It is important that people evacuate as soon as they can!

If you want to go into more detail, please do not hesitate to contact me. I am a Lecturer in Fire Engineering at Glasgow Caledonian University.