单词：moderator material
moderator material的用法和样例：
例句
- The uranium may be put into the reactor in the shape of rods, and the rods surrounded with a neutron-slower, or moderator.可以把铀做成棒状放在原子反应堆内，在铀棒的四周，围一层中子减速剂即节速剂。
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