1. Light water reactor( LWR) 
   轻水反应堆
2. A water-cooled engine, nuclear reactor 
   水冷式发动机、核反应堆
3. a nuclear reactor that uses water as a coolant and moderator; the steam produced can drive a steam turbine. 
   用水作为冷却剂和缓和剂；产生的水柱能驱动水轮发动机。
4. A coolant, which may he liquid sodium, water or some other substances can carry away the heat produced in the reactor. 
   像液体钠、水或其他一些物质这样的冷却剂能吸走反应堆所产生的热。
5. A substance, such as water or graphite, that is used in a nuclear reactor to decrease the speed of fast neutrons and increase the likelihood of fission. 
   慢化剂一种物质，如水或石墨在核反应堆中用来减缓中子运动速度和提高裂变可能性的物质

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