Correct use and maintenance of gas bomb in laboratory is introduced to ensure the safety in its use.

介绍实验室气体钢瓶的正确使用与维护，确保实验室气瓶的安全使用。

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After the air deflation, turn off "power switch", put the rubber surface up to half vertical, protects the compression gas bomb reed.

放气后，关闭“电源开关”将橡胶面盖半立，以保护压缩气弹簧。

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More than 100 rescue workers, firefighters, sniffer-dog squads and bomb and gas experts were deployed to the gutted building in a subsidized housing complex in the city of Reims, east of Paris, officials said.

NPR: 2 Die After Explosion, Building Collapse In France

In early January, a car bomb demolished a gas station close to a hospital in Barzeh, killing civilians.

CNN: STORY HIGHLIGHTS

Since 11 September, New York sees the suicide attacker as its greatest foe - be they intent on delivering a lorry bomb, a gas canister or hijacking another airliner - and has geared its security measures accordingly.

BBC: Met chief learns NY terror lessons