Helicopters have dumped approximately 30 tons of seawater on the No. 3 reactor building to attempt to cool it down, but officials are still trying to figure out if it had any effect.

为了使三号反应堆冷却，直升机已经在那里倾泻了30多吨海水，但是官方仍然无法知道此方法是否有效。

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Steam generated by the heat of a cooling down reactor has enough force to run a turbine, which then runs a pump that provides coolant to the core.

由冷却的反应堆产生的蒸汽足够运行一台涡轮机，然后该涡轮机运行一台水泵为反应堆提供冷却剂。

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To shut down a reactor, safety valves are opened to release the steam and water is used to then to cool down the reactor core.

关闭核反应堆时，需要打开安全阀门释放蒸气，然后用水冷却堆心。

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North Korea has shut-down and partly dismantled its nuclear reactor complex under terms of the accord.

VOA: standard.2009.03.25

This should also be an opportunity for Westinghouse, which has designed the third-generation AP1000 reactor to shut down safely even in the event of complete loss of electric power.

FORBES: Reports Claim Meltdown At Japanese Reactor

In early April, the cooling system at one of the pools containing spent - but highly radioactive - fuel rods in reactor number three broke down for about three hours.

BBC: IAEA calls for improvements at Japan's Fukushima plant

The drywell is a large steel pressure vessel that looks like a giant upside-down pear and holds the reactor and primary pumps, and the wetwell is a large toroidal vessel that looks like a donut.

FORBES: Explainer: What Caused The Incident At Fukushima-Daiichi