为了写这本书，他在心里酝酿了很久。

Wèile xiě zhè běn shū, tā zài xīnlǐ yùnniàng le hěn jiǔ.

In order to write this book, he let the ideas brew in his mind for a long time.

这个改革方案已经酝酿了好几年。

Zhè gè gǎigé fāng'àn yǐjīng yùnniàng le hǎo jǐ nián.

This reform plan has been brewing for many years.

会议上大家先自由讨论，为正式决议酝酿气氛。

Huìyì shàng dàjiā xiān zìyóu tǎolùn, wèi zhèngshì juéyì yùnniàng qìfēn.

At the meeting everyone first discussed freely to build up the atmosphere for the formal resolution.