any substance used to slow down neutrons in nuclear reactors
in the Presbyterian church, the officer who presides over a synod or general assembly
someone who presides over a forum or debate
someone who mediates disputes and attempts to avoid violence
例句
用作名词 (n.)
Anyone who feels that a posted message is objectionable is encouraged to notify an administrator or moderator of this forum immediately. 感到一条公布的消息该反对的任何人被鼓励立即通知一名管理者或者这个论坛的仲裁人。
美
['mɑːdəreɪtər]
