名詞 moderator:

1. any substance used to slow down neutrons in nuclear reactors
2. in the Presbyterian church, the officer who presides over a synod or general assembly
3. someone who presides over a forum or debate
4. someone who mediates disputes and attempts to avoid violence

mod.er.a.tor

n.（名詞）
One that moderates, as:
仲裁的人
One that arbitrates or mediates.
公斷人或調(diào)解人
One who presides over a meeting, forum, or debate.
主持人：主持會(huì)議，論壇或討論會(huì)的人
The officer who presides over a synod or general assembly of the Presbyterian Church.
主持官員：主持基督教長(zhǎng)老會(huì)的會(huì)議或大會(huì)的官員
Physics 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.
【物理學(xué)】 慢化劑：一種物質(zhì)，如水或石墨在核反應(yīng)堆中用來(lái)減緩中子運(yùn)動(dòng)速度和提高裂變可能性的物質(zhì)