moot

He says that they should have foreseen the accident, but that point is moot. [=debatable]他说他们本该预见到了这场事故，但那个观点是有争议的。

The court ruled that the issue is now moot because the people involved in the dispute have died.法庭宣布这个问题不再重要，因为此次争端的相关人员已经死亡。

I think they were wrong, but the point is moot. Their decision has been made and it can't be changed now.我认为他们是错的，但这点已不重要了。他们已经做出决定，现在不可能更改了。

The idea has been mooted in Congress, and it should be a topic of discussion for some time.这个观点已经在国会提出了，它在一段时间内应该成为讨论的话题。