这个主意倒不错，可实施情况不理想。

The idea was good, but the execution was poor.

《牛津词典》

这个主意听起来不错，但我认为它实际上行不通。

It sounds like a good idea, but I don't think it will work practically.

《牛津词典》

这主意乍一看不错，但肯定存在问题。

It seems like a good idea on the surface but there are sure to be problems.

《牛津词典》

Avoiding foods that are high in sugar is a good idea to begin with, but then paying attention to the glycemic index research would suggest is a very good idea as well.

从远离高糖食物着手是个主意,留意血糖指数研究也是一个不错的想法

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Chinese sounds good, but I don't know.

听起来不错，但是我也拿不定主意。

What do you 实战 - SpeakingMax英语口语达人

You know it's not the worst thing you ever wrote, and it's not the best thing you ever wrote, and it has a couple of nice ideas, but maybe it could be better.

你知道那不是你写过的最差的东西，也不是最好的，里面也有几个不错的主意，但也许本来可以写得更好一点。

耶鲁公开课 - 死亡课程节选