2 sentences for 前期 (qián​qī)

1. 这一阶段的产出远高于前期。

   zhè yī jiē​duàn de chǎn​chū yuǎn gāo​yú qián​qī.

   The output of this stage is much higher than that of the previous period.

   Source: Dong Chinese Dictionary

2. 项目的前期准备工作非常繁琐。

   xiàng​mù de qián​qī zhǔn​bèi gōng​zuò fēi​cháng fán​suǒ.

   The preliminary preparation for the project is very tedious.

   Source: Dong Chinese Dictionary