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
Designed to conserve human energy in performing work or to decrease the amount of human labor needed. 节省劳力的设计用来在工作时保持人体能量或减轻劳动强度的
They are making further efforts to decrease military spending. 他们正在做进一步的努力来减少军费开支。
