4 sentences

1. 期年之后，成效显著。

   qī nián zhī​hòu, chéng​xiào xiǎn​zhù.

   After a full year, the results were remarkable.

   Source: Dong Chinese Dictionary

2. 这项新政策已经初见成效。

   zhè xiàng xīn zhèng​cè yǐ​jīng chū jiàn chéng​xiào.

   This new policy has already begun to show results.

   Source: Dong Chinese Dictionary

3. 他在学术研究领域的成效极著。

   tā zài xué​shù yán​jiū lǐng​yù de chéng​xiào jí zhù.

   His achievements in the field of academic research are very prominent.

   Source: Dong Chinese Dictionary

4. 立见成效。

   lì​jiàn chéng​xiào.

   Produce immediate results.

   Source: Dong Chinese Dictionary