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. 慢化劑一種物質(zhì)，如水或石墨在核反應堆中用來(lái)減緩中子運動(dòng)速度和提高裂變可能性的物質(zhì)
Designed to conserve human energy in performing work or to decrease the amount of human labor needed. 節省勞力的設計用來(lái)在工作時(shí)保持人體能量或減輕勞動(dòng)強度的
They are making further efforts to decrease military spending. 他們正在做進(jìn)一步的努力來(lái)減少軍費開(kāi)支。
