This fallout material decays over a long period of time, and is the main source of residual nuclear radiation.

尘降物需要很长的时间才会衰减，这是核辐射残留的主要来源。

youdao

Emergency batteries worked for 10 more hours but when they ran out, an alternative power source had still not been connected. Residual radioactivity in the core continued to build up heat.

应急电池工作了10多个小时，但是当电量耗尽，替代电源还是没有连接上。

youdao

And we also have a residual heat removal system that also takes the heat from the torus and transfers that heat to an external source providing coolant water to continue to re-circulate the sprays.

我们还有一个余热去除系统，那将凸面的热量除去，并将热量转化为外源，提供冷却剂水，让它能够继续，将喷雾再循环。

youdao

Veolia Environmental Services was the other firm fighting to run the incinerator, and whose spokesperson said it believed it was "sympathetic with the local environment and represented a unique opportunity to use the residual waste to provide a secure source of sustainable energy and heat to the neighbouring Tata Steel steelworks - a major source of employment in the area".

BBC: Artist's impression of a Viridor plant in Cardiff