The way these pebble bed reactors work is the helium comes in up the side and down through the pebble bed. It's not a fluidised bed.
这些卵石层反应堆运作的方式是，氦从这面的上面进来，然后，通过这个卵石层再出去，这不是液化层。
It has also continued to develop a novel "pebble bed" nuclear reactor that is smaller and probably safer than conventional reactors.
它还在继续开发一种新型的“球床”核反应堆，这种反应堆规模更小，比传统的反应堆更加安全。
Germany led the initial research into pebble-bed nuclear reactors and built its own research version in the 1960s.
德国第一个开始了球床核反应堆的研究，并于60年代建造了一个用于研究的版本。
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