Velez and other fire fighters throughout North America, who give similar presentations, will never know how many lives they save through their talks.

维勒兹和其他北美的消防员也做过类似的报告，他们永远不知道他们的演讲拯救了多少人的生命。

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He displays fire fighters' equipment, including the oxygen mask, which he encourages his listeners to play with and put on.

他展示了消防员的装备，包括氧气面罩，还鼓励听众把玩并试戴氧气面罩。

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Men and women, cops and fire fighters watched and wept.

男女老幼、警察和消防员注视着，哭泣。

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But there are some privately run fire fighters - for example, at East Midlands Airport.

BBC: MP Chris Leslie warns of fire service privatisation

Fire fighters used breathing apparatus to allow them to work in the smoke-filled section of the building.

BBC: Glasgow Airport

About 100 fire fighters fought the fire before it was put out, fire chief Paul Berardi said.

CNN: STORY HIGHLIGHTS