"A good idea" can be expressed in Engpsh as "a great suggestion" or "a clever notion".

The origin of the phrase "a good idea" can be traced back to the late 16th century, when "good" was used to mean "useful" or "beneficial". Over time, the meaning of "good" has evolved to include "pleasing" or "desirable".

Examples of "a good idea" in Engpsh:

"Let's take a picnic to the park. That sounds pke a good idea."
"I think it would be a good idea to save some money for a rainy day."

In both of these examples, "a good idea" means a suggestion that is sensible and worth considering.

中文翻译：

"一个好主意" 可以用英语表达为 "a great suggestion" 或 "a clever notion"。

"一个好主意" 这个短语的起源可以追溯到 16 世纪晚期，当时 "good" 用于表示 "useful" 或 "beneficial"。随着时间的推移，"good" 的意思已经演变为包括 "pleasing" 或 "desirable"。

"一个好主意" 的英文例句：

"Let's take a picnic to the park. That sounds pke a good idea."
"I think it would be a good idea to save some money for a rainy day."

在这两个例子中，"a good idea" 意味着一个明智且值得考虑的建议。