propellant moderator

• 推进剂减速剂

propellant moderator的用法和样例：

例句

1. 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。