Once fire takes place, people on the site can wear the fire escape mask, which is a fire-resistant and heat-resistant helmet, to protect themselves, so they can leave the fire safely.

火灾逃生面具是一旦发生火灾，在场人员能迅速戴上阻燃、隔热的头罩，能保护生者不受伤害，安全离开火场。

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When fire takes place, people can use this tool to safely and quickly leave the site.

当火灾发生时，被困人员可以使用，达到平稳、安全、迅速地逃离危险现场。

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But because it is a gas, hydrogen can only be transported and stored safely if it is liquefied or compressed, which takes a lot of energy.

BBC: Hydrogen's energy promise improves