1. The idea for the new product had been gestating in the inventor's mind for years.
新产品的想法在发明家的脑海中孕育了多年。

2. The plan had been gestating for months before it was finally put into action.
这个计划在孕育了几个月后终于被实施。

3. The concept for the novel had been gestating in the author's imagination for years.
小说的概念在作者的想象中孕育了多年。

4. The decision to expand the business had been gestating for some time before it was announced to the public.
扩大业务的决定在宣布给公众之前已经孕育了一段时间。

5. The idea for the art project had been gestating in the artist's mind for months before she finally started working on it.
艺术项目的想法在艺术家的脑海中孵化了几个月，直到她最终开始着手处理。

6. The plan for the new marketing campaign had been gestating in the team's discussions for weeks before it was finalized.
新营销活动的计划在团队的讨论中孕育了几周之后才最终确定。