moderator
/ˈmɔdəreɪtə(r); `mɑdəˌretɚ/ n
1 person who arbitrates in a dispute; mediator 仲裁人; 调解人.
2 person who makes sure that the same standards areused by different examiners when marking an examination 评分监督（统一各主考人评分标准者）.
3 Presbyterian minister presiding over a church court 长老会教会法庭上的主持者.
4 (physics 物) substance in which neutrons are slowed down in a nuclear reactor 减速剂, 慢化剂（核反应堆中使中子减速的物质）.