As the reactor continued to burn, military helicopters reportedly flewover the site and dropped wet sand, lead and boron onto the burning reactor.
因为反应堆的大火仍在燃烧,有消息称,苏联动用了军用直升机,在反应堆上空空投湿砂、铅和硼等灭火物。
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So once the pebble is depleted a fresh pebble can be put it in or it can be re-circulated back in the reactor if its burn-up isn't all used up or the fuel isn't all used up.