2 sentences

1. 研究人员利用电泳技术分离了DNA片段。

   yán​jiū​rén​yuán lì​yòng diàn​yǒng jì​shù fēn​lí leDNA piàn​duàn.

   Researchers used electrophoresis to separate DNA fragments.

   Source: Dong Chinese Dictionary

2. 在观察过程中，研究人员不能对观察客体产生任何影响。

   zài guān​chá guò​chéng zhōng, yán​jiū​rén​yuán bù néng duì guān​chá kè​tǐ chǎn​shēng rèn​hé yǐng​xiǎng.

   During the observation process, researchers must not exert any influence on the subjects being observed.

   Source: Dong Chinese Dictionary