In the experiment, scientists from the University of Bristol grew a layer of cells and exposed one side to cobalt-chromium nanoparticles.

在这项实验中，英国布里斯托尔大学的科学家们培养了一层细胞，将一面暴露于钴铬纳米粒子。

youdao

"One skin cycle takes 30 days (for new cells to reach the top layer of skin), so in order to see a real difference in texture, tone, and clarity, you need to use it for more than a month," she says.

因为一次皮肤循环，也就是新细胞抵达皮肤表层的时间，需要30天左右，所以要想看到肤质、光泽度和清透度明显改观，应该坚持使用新品至少一个月。

youdao

The exocarp contains only one layer of epidermal cells.

外果皮由一层表皮细胞构成。

youdao

The retinal nerve fiber layer is the one part of the brain where nerve cells are not covered with the fat and protein sheathing called myelin, making this assessment specific for nerve damage as opposed to brain MRI changes, which reflect an array of different types of tissue processes in the brain.

CNN: Can an eye exam detect multiple sclerosis?

One is a protective sheath that keeps cells alive for months outside a host body, nourished by a layer of fat.

FORBES: The Science of Small