But the nanoparticles in sun cream protect the skin against the sun by blocking the ultraviolet radiation from entering the body.

但是防晒霜中的纳米粒子通过阻止紫外线辐射进入人体来保护皮肤免受阳光照射。

Because it spends a lot of time in the intense tropical sun, --- the grass mouse has also evolved two separate safeguards against the Sun's ultraviolet radiation.

因为它在强烈的热带阳光下度过了很长时间，---草鼠还进化出两种独立的防护措施来抵御太阳的紫外线辐射。

It could, for instance, amplify chemical reactions that break down ozone molecules, slowing the recovery of the ozone layer and allowing more cancer-causing ultraviolet radiation to reach the ground.

例如，它可以放大分解臭氧分子的化学反应，减缓臭氧层的恢复， 并使更多致癌的紫外线辐射到达地面。