But you can't just breathe in the stuff you need to build DNA, or actin, or a phospholipid bilayer.

但是你无法仅仅靠呼吸来构建脱氧核糖核酸、肌动蛋白或磷脂双分子层所需的东西。

Non-polar molecules, like oxygen, carbon dioxide, and certain vitamins can cross the phospholipid bilayer easily.

非极性分子，如氧气、二氧化碳和某些维生素可以很容易地穿过磷脂双层。

So, just like with our aquatic bacterial ancestors, we need water for oxygen to dissolve into, before it can diffuse across the phospholipid bilayer membrane of our cells.

所以，就像我们的水生细菌祖先一样，我们需要水来溶解氧气，在它扩散到我们细胞的磷脂双分子层膜之前。