“列席”常见的英文表达是 “attend as a non-voting member” 或 “sit in (on a meeting) as an observer”，具体使用可根据语境灵活选择：
1、 attend as a non-voting member
强调“以无表决权成员身份参加”，适用于正式会议场景。
例句：
Representatives from related departments attended the meeting as non-voting members.
（相关部门代表以无表决权成员身份列席会议。）
2、 sit in (on a meeting) as an observer
侧重“作为观察者旁听”，更口语化，适用于非正式或描述性场景。
例句：
He was invited to sit in on the committee discussion as an observer.
（他应邀以观察者身份列席委员会讨论。）
其他相关表达：be present at a meeting without voting rights（无表决权列席）
observe a meeting（旁听会议，不强调列席身份）
选择建议：若需突出“无表决权”属性，用 non-voting member；
若侧重“旁听观察”，用 sit in as an observer 更自然。