定期检查你的血压是个好主意。

It's a good idea to have your blood pressure checked regularly.

《柯林斯英汉双解大词典》

如果你溜走倒可能是个好主意。

It probably would be a good idea if you made yourself scarce.

《柯林斯英汉双解大词典》

“你觉得和病人交往是个好主意吗？”——“说实话，我觉得是，我觉得这是一个非常好的主意。”

"Do you think it's a good idea to socialize with one's patients?"—"Actually, I do, I think it's a great idea."

《柯林斯英汉双解大词典》

It's sort of late in the day for students who have been through the better part of a semester thinking about the nature of death to argue, maybe, it wasn't such a good idea for you to take this class in the first place.

对学生来说有些太晚了,你们经历了大半个学期,思考着如何讨论死亡的本质，也许，你一开始来上这门课就不是个好主意。

耶鲁公开课 - 死亡课程节选

And you know it's not the necessarily a good idea to do it, you start with "The thing is".

你心里清楚这么做并不一定是个好主意，你就可以用“The thing is”来回答他们。

The thing is 课堂 - SpeakingMax英语口语达人