Mitochondria are organelles that provide cells with energy .

线粒体是细胞内提供能量的细胞器。

He concentrated on dna from mitochondria .

他重点关注了来自线粒体的dna。

Mitochondria are inherited from only the mother .

线粒体仅从母亲处遗传而来。

Mitochondria are a cell 's power-packs .

线粒体是细胞的能量包。

But every so often , our mitochondria and their surrounding cells fight .

但是有时，我们的线粒体和周围的细胞相互抵制。